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 and replaceable battery Key Safe Program Product dimensions: 100cm chain length x 15mm shackle diameter Product weight: 4.9 kgs Patent D564339