Detailed Product Description: NIJ Approved, Nickel Plated, High Tensile Stainless Steel, Double-Locking Mechanism, 20 Locking Positions, 2 Keys Included The UZI-HC-NIJ are NIJ Approved, Nickel-Plated High Tensile Stainless Steel Handcuffs with a double-locking mechanism with (20) locking positions. (2) keys included. Comes in silver. These are professional police grade official NIJ handcuffs. UZI combines advanced technical concepts with innovative designs to produce products used and trusted by the Army, Secret Service and Special Forces. Since its launch in the 1950s, UZI has become one of the world's most famous firearm brands and a 20th century icon. Features & Specifications: NIJ approved Double-locking mechanism locking positions: 20 Wrist Opening: 2" First notch inner perimeter: 8.19 Last notch inner perimeter: 5.75" Tightest inside width (widest): 1.93" Distance between cuffs: 2.09" Maximum Length: 9.12" Silver Additional Items Included: Pair of Keys Item Weight (Oz): 9.46 oz (268g) Item Dimensions, Length x Width x Height (In): 4.33 x 3.25 x 0.75