Greenlee 635 Carbide Tipped Hole Cutter Kit,Greenlee,635" /> Multiple tungsten carbide tips for long life and smooth cutting Cut fast, accurate, high quality holes in stainless steel, copper, aluminum, steel Flange stop prevents over drilling Replaceable cobalt steel pilot drill, with split-point tip design, to improve performance and resist walking; eliminates need for "center punch" Maximum cutting depth 8 gauge (4 mm)