High security chain, tried & tested in the streets of New York Four-sided trapezoidal chain links made from triple heat-treated boron manganese steel for ultimate strength Narrow inner width of individual links prevent leverage attacks EV series 4 Disc Lock has Flat keyway locking mechanism for extensive holding power & high picking resistance & an ovalised, extra strong crossbar to withstand pull force & cut force 14 mm hardened steel shackle Sliding dustcover protects & extends cylinder life Long chain is versatile & easy to use Both chain & lock defy bolt cutters, saws, hammers & chisels Weatherproof protective nylon covering allows coiling for easy carrying & protects paintwork 100 cm/ 3 feet 3 inches long Approved to Gold Sold Secure standard