VB3 Vari-Bit Step Drill BitFeature high speed steel construction and steam oxide coating. Patented design two cutting flutes allow for clean burr-free holes. Cuts through materials faster than standard bits. Eliminates the problem of tip breakage on standard drill bits. Applicable Materials: Most Metals, Stainless Steel; Cutting Diam: 1/4 in, 5/16 in, 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 11/16 in, 3/4 in, 1/4 in [Min], 3/4 in [Max]; Cutting Direction: Right; Cutting Edge Material: HSS; Measurement Type: Fractional; Number of Flutes: 2; Number of Steps: 9; Quantity: 1 per pack; Shank Diam: 3/8 in; Spiral Angle: 0° Straight; Step Depth: 1/8 in; Tool Shape: Tree - Step Drill; Weight: 0.15 lb.