Drillco 350N Series Nitro 29 Piece High Speed Steel Mechanics Length Drill Bit Set, Black and Gold Oxide Finish, Round with Flats Shank, Spiral Flute, 135 Degrees Split Point, 1 16" 1 2" in 1 64" increments Power Impact Drivers Precision ground ends and edges Precision ground ends and edges allow for better access without damaging the surrounding material 2 in x 8 in dimensional lumber crosscut capacity at 90° and 2 in x 6 in dimensional lumber at 45° 29 screw machine length drill bits ranging in size from 1 16" to 1 2" in 1 64" increments Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge