Kryptonite New York Diamond Standard U-Lock The Kryptonite New York Diamond Standard U-Lock is at the forefront of bicycle security, crafted to thwart angle grinder attacks with its 26mm-thick, diamond-coated, double-layered steel shackle. It features a revolutionary hardened double deadbolt design, requiring both sides to be cut for a breach for unmatched resistance against twist and cut threats. Equipped with Kryptonite's highest grade disc-style cylinder, it is immune to picking and drilling attempts. A protective vinyl coating safeguards bicycles from scratches, and it includes three stainless steel keys. The lock also comes with a FlexFrame-U bracket for versatile mounting options. It is supported by a 5-year Anti-Theft Protection Offer, promising up to 5,000 in coverage post-registration with Kryptonite. Features: Requires 10 angle grinder discs to be cut (source: Kryptonite) Shackle diameter: 26mm Shackle material: 4 layer diamond coated layered steel Shackle is angle grinder resistant Patent Pending hardened double deadbolt provides additional protection against twist and cut attacks Highest security disc-style cylinder is pick and drill resistant Includes Flexframe U Bracket for convenient multi location mounting Protective vinyl coating won't scratch paint or finishes Includes 3 stainless steel keys Specifications: Shackle size (interior dimensions): 3.75 x 8 (9.5cm x 20.3cm) Shackle diameter: 26mm Kryptonite Security Rating: 10 of 10 Mounting Bracket: Included Note: On eligible locks, customers can opt into Kryptonite's Anti-Theft Protection Offer (Atpo). Purchase a 1-year or 2-year plan for up to 5,000 dollars in theft coverage. Atpo is only available on locks with a Security Rating of 5/10 or greater. See full details, verify eligibility and get registered here.