Ace Martial Arts Supply Heavy Duty Handcuffs and Keys Description This Black 3-Hinged Handcuffs are perfect for self-defense purposes. Features a double lock system for more security and prevents injury. 3 hinge system for more durability and prevents escape. Includes 2 keys and a carrying case. Features: Double cuff lock Black steel construction Triple hinge Product Details: Brand: Ace Martial Arts Supply Blade Material: Alloy Steel Item Weight: 0.6 Pounds Hand Orientation: Ambidextrous Item Package Dimensions L x W x H: ‎6.75 x 4.2 x 1.25 inches Package Weight: ‎0.41 Kilograms Item Weight: ‎0.6 Pounds Brand Name: ‎Ace Martial Arts Supply Country of Origin: ‎China Warranty Description: ‎Manufacture Warranty Model Name: ‎Handcuffs Color: ‎Black Material: ‎Aluminum Suggested Users: ‎unisex-adult Manufacturer: ‎Ace Martial Arts Supply Included Components: ‎Handcuffs Hand Orientation: ‎Ambidextrous Date First Available: March 29, 2010