12.7 mm hardened performance steel shackle. The new patented hardened double deadbolt design offers additional protection against twist attacks. The high-security disc-style cylinder is pick- and drill-resistant. Includes 2 stainless steel keys with an ergonomic design to reduce torque and prevent bending or breaking. Comes with a 4-foot Kryptoflex double-looped cable to secure the front wheel or accessories. New dust cover. Includes the Flexframe U-bracket for convenient U-lock transport at multiple locations. Vinyl protective coating.