12.7mm hardened performance steel shackle New patent-pending hardened double deadbolt design gives additional protection against twist attacks High security disc-style cylinder is pick and drill resistant Includes 2 stainless steel keys, with ergonomic design to reduce the amount of torque, and keep them from bending or breaking New dust cover Includes flexframe-u bracket providing convenient multi-location u-lock transport Protective vinyl coating 2 stainless steel keys Key safe program   Patents 6397648b1, 9079626b2 , 9670698 Product dimensions: 5x 9(12.7cm x 22.9cm) Product weight: 3.2 lbs (1.45 kgs)