Premium Composite Material and Workmanship for Intense Use and Protection Hard stainless steel for safe and reliable use Without the key, the handcuffs cannot be removed and so the handcuffed person is unable to move his or her wrists more than a few centimeters or inches apart Double locking mechanism 5.Two standard keys are provided with each Handcuff technical performance: Precision engineering ensures rotating arm swings through the handcuff, engaging the ratchet bars every time Multi-use: Police & Law enforcement, Military Personnel