Bicycle security for moderate to high crime areas. 13 mm hardened Kryptonium steel shackle. Patented deadbolt locking mechanism for extensive holding power. Flat key 7 disc high security, Pick-Safe disc-style cylinder. Reinforced sleeve over crossbar and cylinder provides enhanced security protection. Reinforced internal housing increases resistance to twisting and leverage type attacks. Offset key location resists leverage attacks and 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. 3 keys, including 1 lighted. The Transit FlexFrame-U mounts quickly and easily and supports the transportation of the most common u-lock sizes. The Flex Frame-U fits bicycle frame tubing 25mm to 80mm whether round, oval, triangular or square shapes. The mounting system allows for 360 degree rotation providing the ability to micro-adjust the lock angle to better fit and align with a bike frames specific geometry. Vinyl coated and weatherproof. Kryptoflex braided steel cable for locking up wheels and saddles and to act as a secondary deterrent. Lifetime Key Registration and Key. 8. 3 cm x 18 cm x 13 mm. Approved to bicycle Silver Sold Secure standard.