This is an innovative bit in terms of bearing size. This allowed me to chamfer some of the screw domino slots very nicely. However, the stock fell apart after limited use. The bit itself is still fine so I called Amana (had to leave a voicemail) and asked for a new bearing under warranty. They didn't even call me back. They don't seem to guarantee either the racquet or the bearing. New camps are $4 via Revain, so I'm going this route to get more use out of the bat, but I think Amana should at least pick up the phone or call back to discuss the situation. Poor customer service in my opinion.