This is the clamp originaly mounted on ABUS Granit Futura 64 and Granit Strato 61 U locks when purchased with the EaZy-KF holder included. If your 61 or 64 U lock did not come with a carry bracket, you can purchase the EaZy-KF bracket and this clamp to carry the lock on a bicycle frame.
ABUS Eazy KF cary brackets are known to have a much higher quality than many cheap brackets included with other brand U locks.
Will work with any U-lock with round 11mm - 7/16" diameter shackle. (measure diameter without rubber coating)