Milwaukee HOLE DOZER Ice Hardened Hole Saw, 2-1/4 in Dia, 1-1/2 in Cutting Depth, 3.5 TPI, 1-7/8 in Overall Length, 1/4 in Dia x 3-1/2 in L Drill, Bi-Metal/8% Cobalt Cutting Edge, Carbon Steel Body, Toothed Cutting Edge, 75/100/150/225 rpm, 3/8 in Chuck, Round Shank, Use Arbor: 49-56-7040/49-56-7055/49-56-7140/49-56-7150/49-56-7210/49-56-7240/49-56-7250 and 49-56-9100, White, Applicable Materials: Aluminum, Cast Iron, Mild Steel, Sheet Metal and Stainless Steel