Abus Granit Extreme 59 U-Lock Constructed from specially hardened steel, the shackle and key security components of this U-lock provide superior durability and protection. The inclusion of an Abus XPlus cylinder significantly increases security by resisting tampering techniques such as lock-picking. Designed for versatility in transport, it attaches effortlessly to tubes ranging from 12-17 mm in diameter with the SH 59 bracket, or can be mounted using the Givi M6M Monolock adapter plate for an integrated solution. Features: U-lock width is 4-3/8 inch width (for all lengths) 3/4 inch (16mm) square double locking shackle Level 20 security X+ key cylinder is user friendly and highly pick resistant Keyed alike to other X+ motorcycle locks, key replaceable Lock body, shackle and internals made from specially temper hardened steel