Sentry handcuffs are stainless steel restraints with I-Beam inspired frames. They incorporate the innovative advances in handcuff design that were pioneered by ASP. Robust and rigid, they have smooth, round edges with conical bows. This revolutionary new design has a frame that is cut from ordnance grade stainless steel and permanently joined by heat treated spiral pins. The result is a handcuff that provides a significant advance in restraint technology. The Sentry Chain Handcuff was designed in the field. Input came from officers and instructors in the over 100 nations where ASP conducts training. As a result, this ASP design incorporates the practical features most requested by officers on the street. Flat contact bows improve application. These forged steel contacts are highly radiused to prevent injury. There is a keyway and double lock slot on each side of each restraint. Both double and single locks are released by turning the key in a single direction. The frame geometry, deep set teeth and precision smooth action eliminate the need for back loading. Sentry Cuffs employ innovative technologies that are available only from ASP. These are duty restraints with exclusive features that increase both performance and safety