Bicycle security for moderate to high crime areas Silver Sold Secure 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 dimensions: 8.3 cm x 18 cm x 13 mm stration and Key Replacement U-lock