ASP handcuffs combine innovative design, advanced materials, and cutting edge technology. ASP handcuffs are the result of an 8 year design effort that incorporates real world design features to set a new standard for safety and security. The high contact bow has fully radiused edges, deep set teeth, and the largest span of locking positions in the industry. ASP handcuff lock sets are color coded and interchangeable. Lock assemblies are extremely smooth with dual-sided stainless steel keyways and high visibility double lock indicators. Both double and single locks release by turning the key in one direction. Lifetime warranty on all ASP products.