Greenlee 645 022 Specifications:Quick Change Carbide Tipped Arbor for sizes 2 3/8 through 3 , 1/2 ShankGreenlee 645 022 Features: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. Removable cutter heads available in sizes from 5/8 through 3 . Flange stop prevents over drilling. Ejector Spring on all sizes above 3/4 makes removal of slug easier. Replaceable, cobalt steel pilot drill with split point tip to prevent walking. Precision carbide teeth for optimum performance and durability. Minimum chuck size of 3/8 9.5 mm