3/8" Hex Shank Arbor 1/2"-20 thd

Use 1/2"-20 thread arbors for 9/16" to 1-3/16" hole saws. Use 5/8"-18 thread arbors for 1-1/4" to 6" hole saws.

View '3/8" Hex Shank Arbor 1/2"-20 thd' in our 2012 Master Catalog (M2D1), page 116