Greenlee 655 Kwik Change Stainless Steel Hole Cutter Kit, 5-Piece Flange stop prevents over-drilling Ejector Spring on all sizes above 3/4 inch 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 Includes 3 cutter heads, arbor, hex key and case