Maximum security U-lock for high theft areasExtra thick 16 mm case-hardened Kryptonium steel shackle resists cutters and leverage attacksCross bar is shielded by a hardened Kryptonium steel sleeve in a double crossbar design for double securityHigh security anti-pick disc-style cylinder with patented double deadbolt lockFlat key with integrated sliding dustcover protects the cylinderThe Transit FlexFrame-U mounts quickly and easily and supports the transportation of the most common u-lock sizesThe Flex Frame-U fits bicycle frame tubing 25mm to 80mm whether round, oval, triangular or square shapesThe 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 geometryApproved to Gold Sold Secure standardApproved to Thatcham CAT3