Cuff Key - ZT 15 Extension Tool w/ Key - Swivel

Can be used with Smith & Wesson 104 Keys to give you a extended high-security key.

From the Manufacturer:

Handcuff keys are of a standard design and are compatible with all standard series handcuffs. All keys are made of heat treated stainless steel and are designed to provide an indefinite period of service. Because of the high grade material and craftsmanship employed, it is possible and practical for us to offer an unlimited lifetime guarantee.