Hardened steel chains with diameters ranging from 8mm to 10mm. The range covers applications that require a low, medium or high security chain. Larger diameter chains use an extended end link that allows the small end link to pass through allowing a higher security closed shackle padlock to be used.Square section.Select Option X3 Square Section Hard Chain 900 x 8mmY3 Square Section Hardened Steel Chain 900 x 10mmY4 Square Section Hardened Steel Chain 1200 x 10mm Add to Basket Quantity