Greenlee® Hole Cutter, Quick-Change, Series: 645, 2 in Diameter, 8 ga Cutting Depth, 3/8 in Arbor, 1/4 x 2-1/2 in Drill, Tungsten Carbide Tip Cutting Edge, Teeth Cutting Edge, 170 rpm Speed, 3/8 in Chuck, 3/8 in Shank, Use Arbor: 645-011, Applicable Materials: Aluminum, Copper, Brass, Fiberglass, Mild Steel, Plastics and Stainless Steel