14mm six-sided chain links made of 3t hardened manganese steel for ultimate strength.Durable, protective nylon cover with hook-n-loop fasteners to hold in place.Includes maximum security New York Disc Lock with 15mm MAX-Performance steel shackle.Patented, oval hardened steel crossbar for extra security.Hardened double deadbolt locking for extensive holding power.High security disc-style cylinder with reinforced anti-drill, anti-pull protection system.Sliding dustcover protects and extends cylinder life.3 stainless steel keys -- one lighted with high intensity bulb & replaceable battery.Key Safe Program.Weight: 6.92 kg