Greenlee® Ultra Hole Saw, Ultra, Series: 925, 7/8 in Dia, 1/4 in Cutting Depth, 14 TPI, 3/8 in Arbor, 1/2 in Drill, HSS Cutting Edge, HSS Body, Toothed Cutting Edge, 350 rpm, 3/8 in Shank, Use Arbor: 925011 Small, Black, Applicable Materials: Wood, Plastic and Machinable Metal