3", 2 1/8", 1 3/4", 3 of 1 3/8", 1 1/8", 1", 2 of 7/8". One arbor is missing the bit. I have not removed the arbors from the saws, so I cannot guarantee they are easily removable.
This hole saw arbor has a 3/8" shank and accepts a 1/4" drill bit. The threaded part that screws into the hole saw looks to be 1/2" threads. Virtually unused.
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