Engineered for ultimate urban bike security, the Diamond Standard U-Lock features a 26mm diamond-coated, double-layered steel shackle designed to resist angle grinder attacks. Its patent-pending hardened double deadbolt mechanism and highest-security disc-style cylinder offer superior protection against twist, cut, pick, and drill attempts. With built-in features like a sliding dustcover, protective vinyl coating, and the FLEXFRAME-U bracket for easy transport, this lock is built for real-world durability. It also includes 3 stainless steel keys, a Key Safe Program, and 5 years of free Anti-Theft Protection Offer (ATPO).