HIGH-SECURITY DESIGN: Made from a 12.7mm hardened performance steel shackle, this bike lock provides excellent resistance against cutting and leverage attacks PATENTED LOCKING SYSTEM: Features a patented hardened double deadbolt design that gives additional protection against twist attacks, with a high-security disc-style cylinder, resistant to picking and drilling MULTI-FUNCTIONAL: This Kryptonite bike lock is ideal to secure your bicycles, sports equipment, gates and fences, tool boxes & ladders, grills & lawnmowers, skateboards, truck bed and more. SPECIFICATIONS: U-Lock interior locking dimensions are 4 in. x 11.5 in, 12.7mm steel shackle with a weight of 2.9 lbs. Includes three stainless steel keys with an ergonomic design EASY TRANSPORT with FLEXFRAME-U BRACKET: Includes a versatile FlexFrame U-bracket for quick and secure mounting to your bike frame, ensuring convenient transport without the need for a bag or backpack