HIGH-SECURITY DESIGN: Made from a 13mm hardened max-performance steel shackle, this bike lock provides maximum 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 Dimensions 3.25" x 9.5". Exterior Dimensions; 5.5" x 12", 13mm steel shackle with a weight of 3.15 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