Hole saw arbor for use with hole saws. It has a 3/8 hex shank, 3/8 chuck, and 5/8-18 thread. Fits saws from 1-1/4 in. to 6-5/8 in. and includes a 1/4 in. pilot drill.

Hole saw arbor with a 1/4" hex shank and 1/4" chuck. It has a 1/2-20 thread and is made of steel. The sheet states it fits saws 9/16 thru 1-3/16" and includes a 1/4" pilot drill.

This is a hole saw arbor with a 3/8 hex shank and 3/8 chuck. It is made of steel and has a 1/2-20 thread. The arbor fits saws from 9/16 in. through 1-3/16 in. and includes a 1/4 in. pilot drill.