http://tinyurl.com/nmwcwys
Greenlee 625-1-3/4 Carbide-Tipped Hole Cutter, 1-3/4-Inch
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 a center punch