Greenlee 645-022 Quick Change Arbor for Sizes 2-3/8 Through 3-Inch, 1/2-Inch Shank Cuts stainless steel quickly and easily Quick change arbor allows you to change cutter heads with a simple push and a turn Use the same arbor for different size cutting heads Flange stop prevents over-drilling Replaceable, cobalt-steel pilot drill with split-point tip to prevent walking