As with all ASP products, the design for these Lightweight Hinge Handcuffs originated in the field. ASP Trainers surveyed instructors and officers throughout the world. The most desirable handcuff features were listed and categorized. The result is a handcuff unlike any other. The design introduces features, construction and materials that are innovative, real world and strong. An optimized frame design was achieved through the use of sophisticated computerized engineering programs. The overmolded aluminum frames of ASP Lightweight Hinge Handcuffs flex to the side when improperly applied to reduce injury potential from excessive lateral stress and provide a reduction in weight. The swivel has traditionally been the weakest part of any handcuff design. The Hinge cuff uses a pin and plate link to provide rigid frame alignment. The stainless steel links of ASP Hinge Handcuffs have a four point pivot structure to maximize handling characteristics.