Perfect headset performance requires accurate machining of the fork crown race44 and this is the tool to do itcuts the outer edge and lower surface of the crown race seata simple adjusting system allows the tool to be a tight fit on all forks44 threaded or unthreaded44 including those with externally butted steerer tubesincludes high speed steel cutters and adjustable collets44 sufficient to cut 265 mm or 271 mm crown race seats on 1 inch forks44 and 301 mm crown race seat on 1