Milwaukee® Hole Saw, Series: Hole Dozer™ 49-56, 3 in Dia, 1-5/8 in Cutting Depth, 4/5, 1/4 in Dia x 3-1/2 in L Drill, Bi-Metal/8% Cobalt Cutting Edge, Carbon Steel Body, Toothed Cutting Edge, 195 /85/130 /65 rpm, Use Arbor: 49-56-7210, 49-56-7240, 49-56-7250 and 49-56-9100 Quick-Change Arbor, Applicable Materials: Aluminum, Cast Iron, Mild Steel, Sheet Metal and Stainless Steel