Perfect fit. My old bottom bracket which had pretty fine teeth slipped a lot but worked much better with the new one (Shimano BB-UN45) which was deeper. My relatively small ratchet didn't provide enough leverage to reach the drive side. (Also keep in mind that the drive side is reverse threaded so you have to turn clockwise to remove) so I had to get a bigger wrench. The tool has a 3/8" socket (all the others I've seen used a 1/2" socket). Depending on your tools, this might work better. It also offers two different sized interfaces for using public keys.
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