14 mm 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 15 mm max-performance steel shackle | Patented*, oval hardened steel crossbar for extra
12 mm six-sided, chain links made of 3T hardened manganese steel for maximum strength | 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 | Patented*, oval hardened steel crossbar for extra