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