Milwaukee HOLE DOZER Ice Hardened Hole Saw, 3-1/2 in Dia, 1-5/8 in Cutting Depth, 3.5 TPI, Bi-Metal/8% Cobalt Cutting Edge, Carbon Steel Body, Toothed Cutting Edge, 145/65/95/45 rpm, Use Arbor: 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