Product information and features. All parts are made from carbon steel with internal parts case hardened. Double 3 Tooth tumbler locking system. Double-link Reinforced Steel Swivel 19 Locking position on 3 mm thick ratchet. 12 Rivet Points (machine riveted) 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). Static load approximately 1 500 N (pulling force). Total length of linked handcuff – 200 mm. open and 100 mm closed. Galvanized single locking keys.