This Viper heavy duty handcuff set is made of nickel plated solid steel. They are designed for the prison service and police officers and are the toughest, most robust handcuffs manufactured today. Individually marked with a serial number. There is no escaping these without the key.
Locking ratchet mechanism, with the pin pushed into the cuffs this fully locks them
On double lock setting, the jaw can be locked against movement in any direction with the pin
During first ratchet click locking, the jaw may be tightened as required