Terrible quality. The threaded and locking holes DO NOT EVEN MATCH the mandrel. The holes were so badly placed that I had to enlarge them to fit the mandrel. And interestingly, one of the two drill bits (which were floating in the box) actually broke in half! It may not have been in transit, which means someone at the factory thought everything was fine. I do NOT recommend this poorly made item. This is garbage and should be removed from Revain.