Professional Handcuffs Silver Steel Police Duty Double Lock w/Keys NEW Specifications Made of Stainless Steel Double Lock Mechanism Includes 2 Keys This Silver Double Locking Handcuffs are perfect for self defense purposes. Features a double lock system for more security and prevents injury. (Double locking system allows cuff size tobe locked in place to avoid injury to detainee).Includes 2 keys.Can Be Used For Actual Law Enforcement Or Security Purposes.