12mm six-sided, chain links made of 3t hardened manganese steel for maximum strengthCinch loop for effective lock-ups using less chainOffers nearly the same in-use length as a traditional 5.5' chain, which means less bulk to carryDurable, protective nylon cover with hook-n-loop fasteners to hold in placeIncludes Evolution series 4 Disc Lock with 14mm MAX-Performance steel shackleHigher security disc-style cylinder with reinforced anti-drill, anti-pull protection systemPatented*, oval hardened steel crossbar for extra securityHardened double deadbolt locking for extensive holding powerSliding dustcover protects and extends cylinder life3 keys – one lighted with high intensity bulb & replaceable batteryKey Safe ProgramPatent D56433933