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 cross bar design is stronger than a typical round tube Hardened double deadbolt design gives additional protection against twist 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-intensity LED bulb for convenient, easy unlocking in the dark Finish Line Dry Teflon Lube already coated inside the lock provides additional durability and protection