Product information and features: All parts made from steel (Pickle in Oil) with internal parts case hardened. Double tumbler locking system. Double Locking System Ratchet and Lock High tensile spring (56-58 HRC). 2 x Reinforced steel Links 4 mm thick 19 Locking position on 3 mm thick ratchet. Handcuff cheeks – 2 mm thick per side. Handcuffs are nickel plated for reinforcing, scratch and wear resistant. Individually packed with 2 keys. 50 packets per box Weight per handcuff – 320 grams. Static diameter – 50 mm (cuff inside diameter). Total length of linked handcuff – 200 mm 12 RIVET POINTS (MACHINE RIVETED) Static load 1500 n 2 x nickel plated double locking keys Security pin in keyhole