Zak Tool #70B-104 Large Non-Swivel Correctional Key, Black. Fits Smith & Wesson Model 104 High Security Handcuffs only. Does not work on any handcuffs except Model 104. Extra long 4 3/4" key has hole for keyring and no swivel that could break off. Constructed of heat treated stainless steel. Preferred key for high security correctional environments. Made in USA.