Hook n Loop fasteners to hold the nylon cover in place. 12mm six sided chain links made of 3t manganese steel. 14mm hardened MAX Performance steel shackle. Patented, hardened oval crossbar design is stronger than a typical round tube. Hardened double deadbolt design gives additional protection against twists attacks. The higher security disc cylinder now includes an anti float feature to keep the discs from moving and readjusting when in transit. Includes 3 Stainless Steel keys 2 new I keys and one high intensit y LED bulb for convenient, easy unlocking in the dark.