ASP Handcuff Keys are designed to withstand the rigors of long term duty use. Conventional keys are stamped from mild steel. They often break or twist off in a handcuff. These "key jammed" restraints create civil liability.Each ASP key is hammer forged, then precision machined. Keys are heat treated for strength and coated with a protective finish. The Plus key is a stainless steel overmolded key with dual wings to aid release of Plus restraints.