This Ultimate Handcuff Key was designed in 2009 at DEFCON 18 and propegated by TOOOL and Deviant Ollam. This is open source information and you can look up the specs. And if you have a little skill, a Dremel, and some calipers you can make your own. But if you would rather just grab one from me and bypass the learning curve and then slide your mouse on over to the Add to Cart button and get one or two.