U-Lock: KY1233- 16mm hardened max-performance steel shackle- Patent-pending hardened double deadbolt for additional protection against twist and cut attacks- Highest security disc-style cylinder is pick and drill resistant- Chain:- 12mm six-sided chain links made of 3T hardened manganese steel for maximum strength- Includes NY Disc Lock with 14mm shackle- Patented oval hardened steel crossbar with double deadbolt design- All keys included