1) Material: Carbon steel 2) ISO9001/2000 Certification 3) US NIJ0307-01 Level 4) Double key 5) Many types for choice Carbon Steel Military Handcuff or manacle popular style and hot selling.Material: carbon steel and nickel platedCircle diameter interval: 47-80mmClosed circle diameter: 51mmWhole length: 200mmWeight: 380gHandcuffed point: 23These products have been passed ISO9001, 2000 Quality ...