Need an extra mount for your U-Lock? Have a strange tube shape you need to mount your lock to? The Kryptonite Transit FlexFrame U-Lock Bracket has got you covered. The heavy duty soft strap contours to your bike frame for a secure fit on bike frame tubes 25mm to 80mm diameter whether round, oval, triangular or square. With the included U-Lock mounts, this bracket is compatible with all U-Locks that have 13mm or 16mm round shaped shackles.