Rivolier Model 03045 high security handcuffs from France. This is the official handcuff model currently used by French corrections agencies. These handcuffs unlock with the barrel key when in single lock. They double lock with a tumbler lock and key. Both keys are required when in double lock position. The double lock tumbler keys are keyed uniquely for each set- they are not interchangeable if you have multiple sets. This results in a very high level of security when double locked. Aluminum bodies with steel swinging bows and chain. Weigh 10.6 ounces. 1 barrel key and 2 tumbler keys included.