Kryptonite 5ft. Fahgettaboudit Chain and New York Disc Lock 14mm, 6-sided chain links made of 3t manganese steel provide ultimate strength Durable, protective nylon cover with hook-n-loop fasteners to hold it in place New York Disc Lock features 15mm hardened MAX-Performance steel shackle and higher security disc-style cylinder Patented, hardened oval crossbar design is stronger than a typical round tube Hardened double deadbolt design provides additional protection against twist attacks