Milwaukee® Ice Hardened™ Hole Saw, Series: Hole Dozer™ 49-56, 2-1/4 in Diameter, 1-1/2 in Cutting Depth, 6 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 Speed, 3/8 in Chuck, Round Shank, Use Arbor: 49-56-7210, 49-56-7240, 49-56-7250 and 49-56-9100 Quick-Change Arbor, White, Applicable Materials: Aluminum, Cast Iron, Mild Steel, Sheet Metal and Stainless Steel