The Kryptonite Kryptolok Long Shackle U-Lock is Sold Secure Gold & is designed for bicycle security in moderate to high crime areas. The lock is made from a 13 mm hardened Kryptonium steel shackle with a patented deadbolt locking mechanism for extensive holding power. The Kryptonite Kryptolok comes with the Transit Flex Frame-U mount. The Flex Frame-U fits bicycle frame tubing from 25mm to 80mm whether round, oval, triangular or square shaped. The mounting system allows for 360 degree rotation providing the ability to micro-adjust the lock angle to better fit & align with a bike frames specific geometry Features High security disc style cylinder Reinforced sleeve over crossbar & cylinder provides enhanced security protection Reinforced internal housing increases resistance to twisting & leverage type attacks Offset key location & overhead cam locking mechanism resists leverage attacks Patented, easy to use, high security Bent Foot design Anti-Rattle bumpers keeps the shackle snug against the crossbar & prevent unnecessary noise 2 keys Rotating dustcover over cylinder protects from dirt & grime Vinyl coated & weatherproof U-lock dimensions: 29.2 cm x 10.2 cm x 13 mm Approved to bicycle Gold Sold Secure standard