Fit:Works on plastic, wood and most metals, including steel, brass, aluminum and copper. Material: High speed steel titanium plating for longer service life. Size:0.16"-0.47"(4 - 12 mm) 13 Steps 0.16"-0.79"(4 - 20 mm) 9 Steps 0.16"-1.26"(4 - 32 mm) 15 Steps. Design: Hex Shank and shank is small enough that they should fit any standard size chuck such as that on a small drill press or hand held drill. Drilling Action: Two-flute design provides faster, smoother cutting without walking and a tri-flat shank ensure a firm grip.