Milwaukee® Hole Saw, Series: Hole Dozer™ 49-56, 1 in Diameter, 1-5/8 in Cutting Depth, 4/5 TPI, 1/4 in Dia x 3-1/2 in L Drill, Bi-Metal/8% Cobalt Cutting Edge, Carbon Steel Body, Toothed Cutting Edge, 525/235/350/175 rpm Speed, 1/2 in Chuck, Hex Shank, 3/8 in 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