Assassin's Creed Hidden Blade - Functional Prop!!

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In this Instructable I will be teaching you how to build a working replica of the Hidden Blade from the Assassin's Creed video game series. Don't be intimidated by the number of steps involved, this is a fun project that should only take you a few days in your workshop and should only cost you around 30 or 40 dollars. 

My Design Goals for this Project:
  • I wanted the Hidden Blade to be functional, (to either extend or retract by moving my hand or wrist).
  • I wanted it to look as nice as possible and as real as possible.
  • I wanted it to be easy to build.
  • I didn't want it to require a lot of special parts or tools.

The process of making the Hidden Blade can be broken down into two main parts:
  • Building the blade mechanism (Steps 2-6)
  • Making the Leather Bracer (Steps 7-13)


Hidden Blade Mechanism Materials List:
  • 16” Drawer Slide – This will be what holds the blade and allows it to extend and retract.  You can purchase this from home improvement stores like Lowes or Home Depot for about $6. It is important that you get exact same one that I used otherwise the measurements won't work out properly. examine the included picture for product details.
  • Replica Blade – I used a replica WWII dagger for this. the measurements of the blade are 10.5"long, 3/4" in width at the widest point, and 1/8" in thickness. These measurements, especially the 1/8" thickness, are important because there is not a lot of clearance between the moving parts of the hidden blade so be prepared to do some file work to make things fit. To get the blade, dismantle the dagger and discard the handle, pommel, and cross guard components. The blade I used came very dull with smooth rounded edges, if yours is sharp or pointy I highly advise that you sand away the edges so that they are nice and dull, this will make it safer to use and may keep you out of trouble. Cost $12, purchased at local flea market.
  • Small Coil Spring – This spring will be what retracts the blade when it is extended.  It needs to have very light pull strength and should be 3 to 4 inches in length and approximately 1/4" in diameter.  I purchased mine from Lowes home improvement store as part of a variety pack of springs for around 3 dollars.
  • Flat Spring – This will hold the blade in place when it is extended.  you can make this component out of an hacksaw blade, simply cut off a three inch piece of the blade and grind away the teeth.
  • Assorted small nuts, bolts, and washers – The size of the nuts, bolts, and washers doesn't really matter, anything around 1/8” will do fine.  You’ll just have to drill your holes based on the size of bolts you are using.
  • Small Nails – These will be cut and turned into rivets to attch the blade lock in step 5.
  • Rubber Washer – when the blade retracts it retracts with a lot of force, this will be used to dampen that force i.e. shock absorber. you can purchase rubber washers in various shapes and sizes at hardware stores, you do not need to have the exact one pictured, just something similar.

Leather Bracer Materials List:
  • 2 square feet of 5 or 6 oz. leather – This can be purchased at leather suppliers such as Tandy Leather, however you can also use leather from an old suitcase or coat to cut down on cost.
  • Leather Dye – For coloring and finishing your leather, if you use repurposed leather from an old suitcase or coat you won’t need this.
  • Button Snaps – These can be purchased from retailers such as Tandy Leather or Michaels Crafts.
  • Rapid Rivets – These are used to attach the blade mechanism to the bracer. They can be purchased from Tandy Leather or Michaels Crafts.
  • Ring – Pick something that fits either your middle or ring finger.
  • String/Cord – Pick something strong but light, kite string or the inner strands of paracord work very well.  You’ll need about 1 foot of this.

  • Dremel Tool and Metal Cutting Disks – You will use these for cutting and modifying the draw slide parts. If you don't have access to a Dremel, you can also use a metal hacksaw for the cuts.
  • Files and Sand paper – For removing sharp edges left by Dremel cutting disks.
  • Drill and Drill Bits – You can use a hand held drill or a drill press, both work well.
  • Wire Cutters – For cutting your spring to adjust its strength.
  • Screw Drivers – Installing screws.
  • Metal Center Punch - For marking where you are going to drill holes on the drawer slide and blade.
  • Hammer – for peening down rivets.
  • Xacto Knife/Utility Knife – For cutting your Leather.
  • Paper or Poster Board – For creating patterns for your bracer.
  • Leather Working Tool (Beveler) - This tool is used to create the Assassin's Creed symbol and designs on the leather bracer. The one I used is known as a B60 Craftool Beveler Stamp and is available from Tandy Leather for around 8 dollars. 
  • Awl/Drill/Leather Hole Punch – Some way of putting holes in leather.
  • Ruler – Creating patterns.
  • Pencil – Marking patterns on leather.
  • Permanent Marker - For making patterns and cut lines.
  • Safety Glasses - Always wear eye protection when drilling and cutting the metal parts of this project.

Disclaimer:  Please use common sense when making and wearing this prop.  If you have any concerns about the blade material feel free to replace the steel blade with a wooden or acrylic analog.  If you're planning to tackle this project then you most likely already have all the skills necessary to make whatever changes you deem necessary to make this prop suitable for your specific situation and needs. Be safe and be smart!
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lane443 days ago
High Matt 2 silver . If you could I would like you to make 2 pairs if 2 hidden blades each how you made them on your video n and I would pay for both pairs and I would like them fit a 14 and 15 year old
lane443 days ago
Hi Matt2 Silvers . Could you make 2 pair of 2 hidden blades each like you did in your video and I would be willing to buy them for however much if you can . My email is
lane443 days ago
Plus make the gauntlet longer to cover it up . I will pay a lot for them if that is what you would ask
lane443 days ago
If you would be willing to sell a pair then could you make them fit a 15 year old have the blades and slide covered to make it look less conspicuous
lane443 days ago
Matt2 Silver . Would you be willing to sell a pair of 2 hidden blades
JaredG12 days ago

Is it possible to put the blade on the inside of the leather bracer to make it look less conspicuous?

ChristinaD119 days ago

Still very cool

ChristinaD119 days ago

How do you get the blade to extend? That part was unclear for me when watching your video.

Does it only retract?
Tkdman0001 month ago
What are the exact measurements of the coil spring you used?

this is my email

this is my email

hi matt please send me pdf file i cant pay for pro member i'm a real fan of assassins creed and i really want to make this blade please!!!!!!!

hi matt please send me pdf file i cant pay for pro member i'm a real fan of assassins creed and i really want to make this blade please!!!!!!!

nichg1 month ago

can you be more clear on attaching the blade to the slider and can i make the sliding rail shorter i'm younger and dont have as long arms

guys i want pdf file and i'm in iran and i cant pay for pro member please send me pdf please i want to create this!!!!!!

nichg1 month ago

can you tell me the exact brand or model for the drawer slider.i want my blade to function properly to the provided instructions

nichg1 month ago

can I use custom Velcro straps instead o leather greaves. I intend to make the hidden blades from assassin's creed black flag

JustinP51 month ago

what keeps the hidden blade part from falling out of the bearing track

Matt2 Silver (author)  JustinP51 month ago

Well there are a few things that keep it in place. on the front end, the blade lock engages which keeps the blade extended but also keeps it from over extending. And on the back there is the custom bracket that the coil spring is mounted to which keeps the blade from coming out the back end.

Zombot5671 month ago
Can you find a store that has the dagger
Matt2 Silver (author)  Zombot5671 month ago

wild bills whole sale sells a WWII replica dagger that works well for this project. It's not exactly the same as the one I use but it is close enough, It has a flat decorative section towards the back of the blade that makes it very easy to drill holes for the mounting screws. just do a quick Google search and it should be one of the first options.

can you have this in dual action? extend-retract mechanism?

Matt2 Silver (author)  alainroyromero1 month ago

There are ways to do that, an I have experimented with those mechanisms, unfortunately they're far more complex to make and take some advanced machining skills to create. Google "double action OTF knife" to get an idea of the mechanism and how it would work.

HenryP21 month ago

i am from england and i really want to know where i could get a drawer slide eg a web page that might be useful

Matt2 Silver (author)  HenryP21 month ago

I'm not sure HenryP2, I'd suggest checking out the forums as one of the other UK members might be able to help you out.

Tkdman0001 month ago

Would it be possible to use something like a letter opener instead of the dagger?

Matt2 Silver (author)  Tkdman0001 month ago

absolutely, you could mount almost anything to it, even wood or plastic blades which would make it legal for things like cosplay conventions or trick or treating.

can you please send the pdf file into my email address? my email is

NeerajC1 month ago

my email is plz email me the pdf

TristanS1 month ago

Hello,can i have the PDF files please ?

My Email is: .

Thank you .

LarryM12 months ago

If I may, I would like to see the PDF files for this instractable as I would not like to pay to be able to see them. I am in the progress in making a AC4 cosplay costume, and all I need to know is the hidden blades. I do not want to waste my money on a toy object that could break in less than a few uses; I would like to make something durable that is worth my money to be spent. Thank you for reading this, just send me the files if able to me. Again, Thank you.

Matt2 Silver (author)  LarryM11 month ago

Hi LarryM1,

I'd be happy to help you out, just PM me your email address.

Ok, my email is Thanks for asking!
JustinP51 month ago

what was the tension of the spring please?

Matt2 Silver (author)  JustinP51 month ago
Hello Justin,

That darn spring can be such a pain in the but to find. Lowes use to have a variety pack of springs that included one with just about the perfect tension for the hidden blade but for some reason the packs don't include that spring anymore. I have found that the springs used on decorative plate holders (like for mounting a fancy plate onto a wall for display) work pretty well for this project. They are long, have a fairly light pull weight, and the best part is that each plate holder comes with 3 or 4 springs so you have extras. you can but decorative plate holders at places like Walmart or Michaels Crafts.
Hope that helps, I wish I new the exact tension of the spring for you but I'm afraid I don't. (you may also want to consider a rubber band, I know it isn't as attractive looking as a coil spring, but it would give a very light pull and they are easily available, plus it's easy to find replacement rubber bands.)
Best Regards,
JustinP52 months ago

what kind of leather did you use?

Matt2 Silver (author)  JustinP51 month ago

hello JustinP5,

I used 6 ounce vegatable tanned leather. You can buy it from retailers like Tandy Leather but I would check a local saddle maker or upholstery shop as they probably have scraps that you could purchase for a fraction of the price that Tandy would charge.

and also what is the tension on the spring because everything that I found was too tight
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