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 “in-use” length as a traditional 5.5' 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. HIGHER 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 KEYS – one lighted with high intensity bulb & replaceable battery.Key Safe Program. Product dimensions: 4.25' (130cm) chain length, 14mm shackle diameter. Product weight: 10.55 lbs (4.79 kgs).