* Compatible with 13mm and 16mm (round) shaped shackles* Mounts quickly and easily and supports the transportation of most common U-lock sizes* Unique 360 degree rotation provides the ability to micro-adjust the lock angle to better fit and align with a bike's frame specific geometry* Single point attachment and adjustment design allows for adjustment without removing the bracket completely* Heavy-duty strap system contours to the shape of the bicycle frame providing constant contact with the tube while in transit* Fits bicycle frame tubing 25mm to 80mm whether round, oval, triangular or square shapes