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!

Step 1: HIdden Blade - Dismantling the Drawer Slide

Start building yoru Hidden Blade by taking apart your drawer slide.  The slide is built with little tabs of metal that are bent up to keep the inside parts of the slide from comming out, so the first thing you have to do is find those tabs of metal and pound them down flat with your hammer.  The tabs are located on the front and back of the outside slide, if you're having a hard time finding them, use the pictures for reference. 
Once the tabs are pounded flat the drawer slide will pull apart.  As you dismantle the slide the bearings that sit between the inside and outside slides will fall out, use a small dish to catch them as they fall, don't worry if you lose a few, you won't need them all.
When everything is taken apart you should have the parts shown in the last picture of this step, the outside slide, the inside slide, the bearing track, the bearings, and the bracket.
<p>Where can I get the dagger at? I live in Missouri and cant find one. Please help &deg;_&deg;</p>
<p>hi my name is miche&aacute;l and i would like to know could you make me a hidden blade like to one above if you can't i understand but if you could you please email me at</p><p>michealhallissey123@gmail.com </p><p>thank you </p>
<p>Hi, This is fantastic but I don't have any of the tools. Can I buy 1 or 2? Thanks</p><p>Rbelkacem@icloud.com</p>
<p>can you do a step-by-step of the mechenism please?</p>
Do you have any for sale i would like to buy some from you write back to know the price it will be
<p>Hi!</p><p>If you are willing to make one and sell it to me I would be more than happy to pay what is nessesary. I have been looking for a blade for quite some time and yours is one of the best I have seen. If you are intrested please contact me.</p>
How much would you sell one to me for?! That is awesome ive been trying to find one that is easy to use and yours is the only one ive found
Can u make one like the bionic wolverine claws with a muscle sensor if so how much would u charge for one of those
<p>Do you have any more Assassins Creed blades for sale by any chance? </p>
sure do, I have two left, I'd be happy to send one your way for $20 shipped. let me know if you're interested and if so I'll send you my paypal info.
I would like to buy one from you, your work is the best I have ever seen
send me your paypal info i will buy it
<p>Hey do you have anymore im looking forward to buy one</p>
<p>I'd like to buy a set if you have one for sale.</p>
<p>Got any more for sale? If so, what would the price be?</p>
If you have any more available I would be interested in purchasing one or two.
<p>anymore avalable?</p>
I am very interested in buying the last two you have left if they are still up for grabs
I am very interested in buying the two you have left
<p>hello i would love to buy one my email is hirokin4321@gmail.com pls send me message</p>
Do you have any more left or have you made any more? Or possibly could you make one? If possible email me at mad52298@gmail.com
Hey there! I'm working on making a cosplay for Connor from AC3. I was wondering how difficult this actually would be to make because I don't do a lot with tools or anything like that. I'd also need to find a suitable blade. Also, is it possible to make it smaller? I'm tiny so I have short arms haha.
<p>do you have any for sale?</p>
Hey do you have anymore for sale? Id like to buy 2
<p>Hello i was just wondering if you have any for sale and if so that would be great if not that is okay too thanks my email is nichoj732@gmail.com</p>
Are these available to be bought?
Doesnt arm length play a role in building this ?
<p>Would it be possible to make this using 3D printed parts instead of metal?</p>
<p>Hello, I am a graphics designer and prop artist. Would you be willing to sell one to me? Email me if so at williamrpvalentine@gmail.com</p><p>thank you.</p>
I am making my own version off your designs and was wondering if you knew what exact blade you had used.
Cool project! I'd love to make one myself, however I lack the tools required. If you have any left it possible that I could purchase one from you?
Is there any chance I could know the price to get two of these and shipping costs?
<p>hey i was wanting to buy one and was wondering if you had any left</p>
<p>Also is this a fully functioning blade? Or is it plastic?</p>
<p>Hey could I purchase a hidden blade off of you? I'm looking at this list and I'm so busy right now that I'm not sure if I'll find time to do this. If you don't have any left that's perfectly fine. Thanks! </p>
What is the name of the dagger? Is it German, Russian, American? I need details
And I mean like, does the blade have a specific name?
I saw in the comments you have sold these before, and was wondering if i could buy one?
Sorry, that youve sold the blade before, but was wondering if you would do a full prop?
Hey I find this very awesome but I was wondering if you sell the hidden blade
<p>Hey Matt2 Silver I got the time to actually get to you and i was wondering where did you the blade you said WWII But not much detail for all these people talking to you in your email you probably don't have another one so I was wondering where did you get the blade</p>
<p>Also, kind of forgot, what keeps the blade from falling out? I noticed a bend/excess of spring that could allow the blade to slip out some before actually letting it.</p>
<p>I don't have any form of fake knive... have you tried using a real one?</p><p>Also, could you get me a link or specs or a number for the exact spring you used?</p><p>Thanks!</p>
Hi Matt! :D I'd love to purchase one of those blades... But... I live in Peru... Mail me: yamakasi2002@gmail.com<br>Thanks!
<p>Is it possible to make one for me ? If yes, then let me know by email: gwiazdka1996@amorki.pl </p>
<p>http://thirdreichshop.com/wwii-ww2-nazi-german-luftwaffe-officers-dagger-knife/ Is this a good place to also buy it. It seems like it. Same price but you don't seem much simpler</p>
<p>Any more of the those blades left? &gt;.&gt; Iz gotz the needz</p>
yep, I have one left. it's 20 dollars which just covers my costs and shipping (no profit). you can make the payment via paypal at Matthew.r.yeomans@gmail.com. once the payment goes through I'll ship it out to you.
<p>What type of blade is it</p>
Where do you find the leather you used?