Standard design Compatible with all standard series handcuffs Made of head treated stainless steel and designed to provide an idefinite period of service Lifetime guarantee This round swivel key from Zak Tool is compatible with handcuff models that use standard keys.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }