Around the world, security guards and police officers are switching from cheap handcuffs to these durable stainless steel handcuffs. These handcuffs feature a double locking mechanism to guard against tampering. The pushpin locks the cuffs in place and prevents over tightening. The stainless steel provides extra durability and reinforcement. These cuffs are National Institute of Justice approved, giving you confidence and assurance of quality. Two keys are included. Never worry about misplacing your key because you have a spare!