I was restoring an old 1950's drill press and needed an inner bearing puller and got it. All threads are NFT (National Fine Threads). So if you need to make an adapter, remember that these are fine threads. I had to make an adapter because I didn't have a suitable demolition hammer. I did this with coarse thread at first not knowing it was fine thread until I got it. Once I made the correct adapter, these bearings popped out with no problem.
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