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The Universal Standard Handcuff Key is designed to be compatible with most modern police handcuffs. This handcuff key will open up most NIJ certified handcuffs from Smith and Wesson, Peerless, Hiatts, and many more. Constructed from steel and featuring the double locking mechanism tab you can use these handcuff keys to open police handcuffs as well as set the double locking mechanism. Having spare handcuff keys will ensure that your handcuffs can always be used without fear of not being able to unlock them once applied.