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Today we made a fully functional OTF shoe knife like you have seen in Batman (by the Joker) and the spy knife from The Kingsman. With just a drag of the foot back, the dagger style blade deploys quickly. This project is potentially dangerous and should not be replicated. Hope you guys enjoy the video! Let us know your thoughts below.

The knife we used: https://kolourco.com/Smith-Wesson-Black-Oxide-OTF-Assisted-Opening-Grey-44134

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Thank you guys so much for watching!

DIY Automatic SHOE KNIFE! - Hidden Spy OTF Knife (Joker Boot Knife / Kingsman IRL)