Hidden Blade

Almost Ezio-quality hidden blade :)

Full costume or 2010 Halloween can be found at the link below:
http://www.instructables.com/id/Ezio-Costume/

Step 1: Ingredients

This whole blade was pretty cheap. Price breakdown:

• Drawer sliders (2) @ $3 for 2 sets (Axmans surplus store!)
• Ring @ $1.50 each (Target clearance shelf)
• Rubber bands @ practically free...
• Letter opener (AKA blade) @ $1 each (Office Depot)
• Cotter pins (2) @ ~$0.20 each (Hardware store)
• Nuts-size 6
  • brass ones (11) @ $0.09 each (Hardware store)
  • steel ones (~12) as filling on long bolt @ $0.08 each (Hardware store)
  • size 10 brass @ $0.25 each (Hardware store)
• Washer
  • size 6 (8 of them) @ $0.08 each (Hardware store)
  • size 10 (8 of them) @ $0.08 each (Hardware store)
• Bolt
  • tiny size 6 (8 of them) @ $0.08 each (Hardware store)
  • 2" long size 6 @ $0.08 each (Hardware store)
• L-brackets (8 of them) @ special discount, I got 100 for 35 cents :)

That adds up to about $10.50
Not bad!!!

Comments

[rejectameric]

Thanks! Having a hard time, but I'll get it eventually!

[didibemi]

VERY NICE. I just loved your instructable and I'll be doing it this month. Perfect, for real!

[Slrman]

Ideal for a terrorist neophyte. As usual, the TSA would be helpless against this. But they are mostly useless anyway.

[kramerllama]

I feel like you could use a smaller U bracket and smaller bolt for this step, and would reduce much of that clutter from the nuts.

[regby]

How does it retract????

[tetrahydrawho]

I think im gonna try a double spring action so its auto in/out...ill let everyone know how it goes

[LostRite]

I am working on one currently. Hope to be done by the end of January. You can check out prototypes on my website's blog if you want ideas for where to start. Good luck and share :)

[amcmorris1]

I've been trying to make a hookblade (without the blade) for ages, I would use it as a climbing hook for Parkour.. can someone give me some help?

[LostRite]

you mean basically a crowbar shape? but lighter I assume. Were you thinking retractable? if you let me know a few more details such as the length desired I could draw and send some designs to you if i think of anything. As a separate suggestion, I have had some success in pursuits by using poles with a hook at the end (8 foot long poles) and grips twisted into the pipe. The pole allows you to vault, swing and hook assuming you can climb a thin pole and know how to vault. It comes in quite handy and allows you to reach many inaccessible places. The downside being that it isn't concealed easily...

[Dr.Ike]

You could probably use a pen tube instead of all the nuts.

[LostRite]

ideas like that are why I love ibles

[ezra0128]

is it retractable

[LostRite]

yep

[ThePokefan101]

Hi there,
I was just wondering what kind of drawer slides you used, and whether you have any links to websites where I could buy them.
-Thanks

[LostRite]

I would try looking locally as it will probably be cheaper than online (shipping). You are looking for something like this (amazon). The other reason I would recommend shopping locally is that you get to actually see what you are buying. It can be hard to tell online what you are buying a lot of times. Although I'm sure you know all of this already. No promises that that is the right drawer slider, but it looks right to me in the picture and is the right length. Good luck!

[Naitsirhc]

Is it wise to be instructing people on how to build concealed weapons? What happens when this technology makes its way into our schools? Seriously. Many schools already have security and metal detectors. One kid gets stabbed by a weapon like this and instead of starting the day with the Pledge of Allegiance or kids are going to be starting the day with a morning TSA Style Pat Down.

[pipsqueakboy]

Its not like he's teaching them how to make a shank. Hes not teaching them how to make a weapon specifically to shank someone. Besides, If a kid tried to shank someone at school. why make this. They would use a pencil instead anyway.

[mrmerino]

Start the day with the Pledge? I start third hour with the Pledge.

[blacklig]

The internet teaches makes technology far worse than this readily available to anyone with an enabled computer. It is (arguably) a drawback of the internet. But it is a reality. Information is becoming free, and responsibility is becoming more and more personal. Complaining about it won't change it, nor will anything else. Take steps to adapt to it and move on is my philosophy. If you do not want to view such content, or do not want your children to view such content, you have the ability and responsibility to block sites and monitor internet activity until your children are responsible enough to make their own decisions.

[Under_miner]

dude, I think that any kid even if they are stupid wouldn't be that stupid.

[Naitsirhc]

you are underestimating just how stupid, stupid kids can be.

[theubster]

yeah, but you are assuming that most kids will take the opportunity to stab their enemies in a school. Not the case. If a kid is going to be stupid or try and stab someone, not knowing how to make and assassins creed style blade will not stop them. A regular old pocket knife will do. Or a chair. Or a pencil. Or a gun. We are surrounded by weapons, some more potent than others, and we have to trust one another enough to assume we won't be stabbed at any given moment....

[Naitsirhc]

Yeah its true if a kid is pushed to the edge and they snap they might try to get that kid with anything they have at there disposal, but many kids will bide there time, take time to make a hit list and that kind of stupid thing. Kids can have a flair for the dramatic. You can't tell me that the Columbine kid wasn't thinking about "The Matrix." when he shot up his school.

[Ringley]

It doesn't matter if a kid is going to take their time or not... There are many more instructions for making weapons all over the internet. Complaining about this one specifically isn't going to do anything to hinder the hundreds, even thousands of others that are posted all over the web.

If a kid is stupid enough, and angry enough, to want to kill others, you can't blame the people who are teaching others to make weapons. Knives, guns, and any other kind of weapon DON'T kill people. People kill people. Someone with the intent to kill others is going to find whatever way to do so that they can, with or without the internet's help.

As far as your comment about The Matrix goes, maybe he was, and maybe he wasn't. The point is that it isn't the media that is killing people. Games like Grand Theft Auto or Saints Row aren't telling people that it is okay to kill others. The only kids that will be "stupid" enough to start having thoughts like that are kids who have some kind of mental instability. There are far more normal, non-violent children than psychopathic potential murderers in this world.

[mountainman123]

I think you're over estimating our stupidity.

[lunius]

Exactly. Many people who view this may be like me, wishing to make a prop version for recreational use. My Parkour group is beginning to lean towards an Assassin's theme, and making a paper or cardboard blade like this would do wonders for our demo videos.

I have seen much worse stuff than this on the internet.. I can tell you how to make napalm at home for roughly $5 per gallon, I can show you how to make an RGD-5 Hand Grenade, how to dig and cover a pungee pit to match the location. I can tell you how to make a throwing knife out of a blank CD, and a caltrop out of needles. I can build a small forge and forge knives with old soda cans. I learned all this from the internet, and have not ONCE seen ANY of these employed in a school. At my high school, there have been bomb threats and gun threats, and many kids carry knives for their own protection, but not one of them would bother attacking someone in a place with cameras and police officers.

Even mentally unstable people have a basic grasp of common sense.

[Alaap]

use a strong spring to make it retractable so that when you let leave the ring loose the blade will retract

[aweis]

well the problem about a spring making it retract, how will it get out, and if you think just haveit so the spring will not hook till it opens, then it will not open again afterwards.

[mrmerino]

Use a thin rubber band or weak spring, and flick your arm on pulling the catch.

[Techie_Gary]

I had a better one. if u use a mechanical lock, there may be a chance that the locking system would fail so instead, you use your own force by attaching your ball-bearing slide with a copper wire and make a hoop large enough for your thumb to pass through in the other end of the copper wire....... just like holding a dagger yourself.....

[zeratul_mega_freako_fans]

this is soooo freaking AWSOME . im gonna make one asap

[THEGRIMM]

Hey I'm new here but I'm trying to make a hidden blade for a convention how did you get your design for your hidden blade

[FFDPfanJL]

also, what size are the cotter pins

[FFDPfanJL]

could you please tell me what size the drawer slides are?

[Kain...!]

guy , i need to kill some letters

[solopach]

If you'd installed a spring connecting the end of the blade to the back of the drawer slide, the spring tension would keep it retracted, to deploy it you'd need to give it a little momentum with a flick of the wrist, but at least that way when you release it, it retracts by itself.

[EzioAuditore13]

Thats SOOOO freaking Awesome Im gonna make one for sure

[assassinscreedFan10]

im addicted I have not played one other game for months almost a year and i made my own hidden blade out of k-nex and a band

[kramerllama]

Can you provide the exact measurments of the bolts and nuts rather than size 10, or size 6?

[assassino]

is that a dual action(get out and come back) hidden blade or not?

[assassins creed 19]

dude that thing is so beast.im addictid to assassins creed. im soooooo gonna make that,.!!!!!!!!!!!!!! how did you come up with that desighn?

[gmarome]

awesome. I was going to make my own model of the hidden blade that was spring loaded but my friend said that I would blast my hand off. much better design.

[curvy77]

smart friend. hope you listen.

[woodstock246]

Is there something else that I could put in place of the letter opener? Just to play it safe you know.

[Super-Blinky]

A pole with a flag saying 'BANG!'

[Asherzzz6677]

The letter opener should have a rounded tip. If not you could just selotape a draw slider to your arm?! :)

[dehlome]

You could use a nail file, but the letter opener I got had a rounded tip, and even if I tryed to stab through something it would push back and move the cotter pin over it.

[Techie_Gary]

thats why you should use your hand to hold it in place by attaching it with a copper wire.....

[aweis]

what keeps the blade from coming out when you don't want it?

[Asherzzz6677]

The split/cotter pin (I think) :)

[DeathCon88]

Nice costume. :3 Does the blade retract if pressure is applied to the blade's tip?

[Asherzzz6677]

Watch the video at the end :)

[BeliigerantJ]

I like how there is a bloody bandaid in one of these pictures.

[Asherzzz6677]

*Plaster :)

[znading]

how big are the rubber bands???????

[Izn]

How did you drill holes in the metal?

[Jamu3l]

with a drill?

[sozaki]

I dont understand the sizes you put... In my area, (Louisiana), nobody understood the size 10 or size 8 concept, as we need measurements.. If anyone knows about this, please reply :C

BTW, i use Ace Hardware

[splat32]

pretty sure he means
6mm diameter x whatever length

6mm inner diameter, that is

[vreid1]

That's what she said. lolololol

[iamblackjesus]

could you make that where you don't need that many nuts

[Jidokashi]

That's what she said.

[vreid1]

xD I was going to say that
Giggidy.

[SgtJellyfish]

This is an epic blade! Im gonna make on this weekend!

[hihiyoyo7]

would anyone be willing to make me one and ship it, i will pay. E-mail me at [e-mail] and if it breaks (not because i did something to cause it) may i get my money back or get a replacement?

[narcuri]

Doin it.

[Zazzles]

Do you know what brand of drawer slide you used?

[aqdi7]

thanks, this is very cool instruction to make a hidden blade...

:)

[iamblackjesus]

how would i attach it to a leather wrist band like they have on the game

[ccody1]

buy a leather bracer long enough to cover it, cut slits into it, slide thin strips of leather (with buckles) through slits, strap the blade on

[Jakdaman]

Anyone ever told you that you look like George Harrison? :D

[iamblackjesus]

the key looks a little to pushed out could you make it closer to the drawer sliders

[tyler9050]

what if you cant find a draw slider thingy with ball bearings in them?

[EizoLiao]

...

[rafkrr]

That's amazing man! Thanks ^-^ sorry but you can tell me where I find the "Blade"?
Thanks again :)

[LostRite]

the blade part is just an envelope opener that I got from office depot or office max (I can never remember which one is which) really cheap! (less than a dollar each)

[aweis]

office depot, looked it up, it is office depot brand letter opener.

[eturner4]

do they have to be steel/ brass or can they all be steel?

[Assassin Shahriyar]

Very Nice Designs Bro but can it go in and out with the flick a wrist like in the vdeo game.

[Alex Baktax]

can you make it for me?i'll pay you! :DD

[carlpogi_11]

hahaha

[dehlome]

I'll make it for you, for $50 excluding shipping :D

[zelgadisathanasius]

how about making it for 25?

[dehlome]

If its under 8 inches, but if its over 8 inches its gonna be 35, (excluding shipping)

[aweis]

this instructable was made so people can make this, not so people can make money off it. besides it would be cheaper, and more fun to build, added the satisfaction of building it yourself.

[xheronx]

I have only question: It have automatic retract sistem when you release the trigger?

[dehlome]

No, it uses gravity to pull it back into the casing.

[you know me]

Ok, before I get started making this (Actualy before I get materials). Is this version able to stab without the blade retracting? Does this blade just slide out and not lock into place?

[Ardillas]

The blade WILL lock into place once out. This does not mean that it is indestructible though! You can stab through a lot, but I wouldn't know how to describe the breaking force that the blade possesses.

[LostRite]

Yeah, what Ardillas said

[dehlome]

also, you might want to sharpen your blade to actualy stab through things

[berky93]

well I finally completed my own version. I decided to slim it down a bit by not putting another bracket on top (as a top cover) I basically built the entire thing based on memory and improvisation after viewing this instructable a week prior. I had to modify the design a bit, regarding to the cotter pin mechanism. Because the materials I used were slightly different (as in different brands, etc) my blade/ball bearing mechanism wasnt heavy enough to slide downward on gravity alone. so I attached a 3mm piece of steel to the top of it. This worked out perfectly because that allowed my cotter pin to clip to the back of the steel. This was necessary because my local hardware store didnt have any cotter pins that were longer in stock so I wouldnt have been able to clip around the entire mechanism. also, I'm not sure if this is how yours is, but my blade stays retracted by the force of the cotter pin pushing down on the flat side of the blade. It's effective, but the problem is sometimes the blade can slip down just a bit so the tip is poking out of the top of the device. I'm designing a cap that affixes to the cotter pin that would open when the string is pulled and close when it is released. This project makes me sad I never do cosplay. I'd make a sick ezio now (and for the record, ezio>altair. altair is kind of a cocky jerk)

[dehlome]

To awnser your question, yes the pin uses rubber bands to push the blade down and lock it in. I used 2 rubber bands and it wroks great, my only problem is that the elastic I used to mount it to my arm kinda cuts the circulation off a little bit.

[dehlome]

Check it out, blades kinda small, buts its awesome!

[EwwieImp]

I was looking for parts but got confused. What size slide did you use, cotter pin size, and L bracket size?

[dehlome]

I juat got the longest cotter pin that wasnt to thick, and it works good

[dehlome]

Im pretty sure my Brackets were 3/4" by 1/2"

[linkinman84]

Heeeeeeyyy awesome, awesome, blade and everything, just one question. Can you be a bit more specific on the drawer slide's specs? Because I went to Home Depot and there were waaaay more than I thought. Thanks!

[LostRite]

hmmm.... lets see what I recall, I think about 1" wide sliders, the sliders were way longer than needed but that was ok since I cut them down to size (lengthwise). Pretty sure they were 1" wide though.... whatever fits the blade inside though I suppose!

[Noobzrule]

Hey what stores are good for these supplies, cuz i went to walmart and office depot, home depot, etc and they all have too much of something, i want to buy like the amount u listed, so any good stores u can think of? Thanks :)
P.s. Very magnifico idea, i agree with shymt

[dnsd99]

Chances of that are slim-and-none. Just go with the amount closest to what you have. That way you don't have too much extra.

[Noobzrule]

Thanks bro, i would of gone broke if i didt know that haha thanks ;)

[Romadoner]

Are you a wizard?

[Gangasta300]

LOOK AT REAL HIDDEN BLADE SCHEMATICS!!!!

VIDEO :
http://adf.ly/BhBr

[Spedward]

Thats Epic Dude. i gotta try it...Thanks

[shayboaz]

it's very cool but i wish it was pushing out size like in the game or some 1 made very good one you can see in youtube he made full video on it
but tnx

[ninjazombiemaster]

Pretty cool, with specialty parts, it could be perfect. Also, a single-handed trigger would make it easier to use, though probably a bit harder to make.

[LostRite]

it is a single-handed trigger...

[ninjazombiemaster]

Oh, from the video it looked like you needed one hand for the string, and the other to hit the upper part of the key.

[skidude28]

I want to build this but I'm having trouble finding the most important part..

the drawer sliders.

I found everything else with ease. My local Walmart doesn't carry the drawer sliders, and I'm not quite sure where else to look.

[LostRite]

Is there a hardware store (Home Depot, Menards, Ace hardware, etc...) nearby?

[Iridium7]

do you think there is an easy way to spring-load this?

[TechDante]

yes tehre is if you follow indi moguls instructions for teh popout gun attachment its is similar to this
.http://www.indymogul.com/backyardfx/episode/BFX_20090119/quick-draw-sleeve-gun-build. this link should take you to their build

[griffinkid2021]

This seems needlessly clunky. You could probably trim that down a little bit.

[netphreak]

Instead of adding two nuts to the bolt, you could use a #6 lock washer to keep everything in place.

[JamesRPatrick]

Wow that thing is scary!

[zethgaroh]

These things are awesome, but I always felt that they should mount and extend from the other side of your arm, so the blade would be above your hand. It would be more noticeable, but I think there would be a much smaller chance of cutting yourself (since your fingers and hand naturally tend to be positioned towards the underside of your arm). I think I'm going to make one like that- I'll share the results if it works

[JamesRPatrick]

It shouldn't be too difficult to adapt. Post pictures when you're done!

[cool aclaim4]

all ya gotta do is make the metal locking device wider like pencil thigk metal an u can kill some guy

[Edmarinho]

It's very cool, thanks for the instructions.

[Lord Maul]

yeah i have a 3 piece slider too what should i do?

[joeyay]

all the sliders i could find were three piece, and had a slide that was touching the base, so it couldnt hold nuts. any help?

[luvit]

back in the hoosegow, we'd make these out of various materials & trade em for cigs

[ghostrider2]

and the best part is that you dont even need to sacrifice your ring finger to use it.

[skimmo]

could you make this in shoe form?

[Mr. Tick Tock]

Wow. Really clever design. It does look a little bulky though. How will you mount it?

[LostRite]

So far, I'm thinking of using the glove as part of the bracing for impacts. As in, use webbing and sew (with the kevlar thread) it around that cotter pin underneath the end of the casing and sew the other half of the webbing to the glove (a nice climbing glove I found on sale at REI, since the reason I started this costume was for the freerunning!). Also, more webbing on the back just to keep it tight against my arm, with a fabric cut out under the casing so that it doesn't become irritable to wear and use :)

[DELETED_Robert L]

(removed by author or community request)

[LostRite]

Apparently yes. Not even T-Rex can take these things!

[LostRite]

not yet... are they harder to kill?

[Sora_1_2]

I'm still awaiting a well designed DA OTF wrist blade. This is pretty sweet though. I don't see many using the ring.

[Iridium7]

A good thing about this is if you made it a real blade, your palm would be far enough away from it that it wouldn't do much harm. Not to say that stuff won't happen but it is still a possibility.

[cowscankill]

I've seen this design many many times, it works, and I guess it's a good thing to post because I haven't seen none on Instructables yet. Your mech seems a bit... bulky. I made one with a coathanger. I would suggest getting the mech as small as possible.

[karossii]

Great idea, great design, and great instructable! However, a couple of design flaws I could see if you were to try and use this as a real weapon (for defense or offense)... First, the string could easily get caught on or cut by the blade, if the blade were sharpened. Second, if you were to attempt to use the blade in any manner for offense or defense, you would need a very strong attachment to your forearm, as well as a handle of some sort which you could hold onto. Of course a handle would further increase the risk of the string getting caught as the blade extended out. Third, with or without a handle, the blade would need to extend out several inches further to be of any true use. A handle would add this extension, of course, but if you try to go without one, you'd need some other way to compensate. Not meant to be derogatory, just some thoughts... I certainly don't have any great solutions for any of those problems I presented.

[berky93]

I was just thinking to myself, "I have absolutely no use for it, but I really want one of ezio's hidden blades." I'm totally gonna try this

[lug big lug]

i made something like this, but it was spring loaded... it shot out and i cut my hand open multiple times.... so i ditched it... and the design... this is a MUCH better design. It would be cool if it was a double blade like |||||;;;;:::::::;; (noticed it is kinda hooked...)

[bombmaker2]

This is the best design I've seen for this partly because most of the others don't lock like this one. If you had to, this could be used for self defense. (with a sharper, sturdier blade)

[Wolf Seril]

Very nice. The best by far on instructables, and a completely original design as far as I've seen (and I've looked into it a lot).

[shmyt]

You are a genius I would never have considered the bent wire thing. This is amazing and inspiring. 5 stars!