12mm six-sided, chain links made of 3t HARDENED MANGANESE STEEL for maximum strength. CINCH LOOP for effective lock-ups using less chain. Offers nearly the same Òin-useÓ length as a traditional 3.5Õ chain, which means less bulk to carry. Durable, protective nylon cover with hook-n-loop fasteners to hold in place. Includes Evolution series 4 Disc Lock with 14mm MAX-PERFORMANCE STEEL SHACKLE. HIGH SECURITY DISC-STYLE CYLINDER with reinforced anti-drill, anti-pull protection system. Patented*, oval hardened STEEL CROSSBAR for extra security. Hardened DOUBLE DEADBOLT locking for extensive holding power. SLIDING DUSTCOVER protects and extends cylinder life.3 STAINLESS STEEL KEYSÐ one lighted with high intensity bulb & replaceable battery.Product dimensions: 2.5Õ (75cm) chain length, 14mm shackle diameter.