This attachment looks like discarded junk. The mandrel has no edge to keep the cutting edge straight. Any lateral force can cause the torch to become unbalanced. Can be dangerous on a high speed tool. The milling cutter is only attached to the mandrel with a pan head screw. The hole in the cutter is larger than the diameter of the screw, so the taper on the head of the screw keeps it straight. In addition, the screw is too short and only holds a few turns. I can't believe a reputable company would sell such a poor design. Because of this, I will never buy a CMT tool again.