Industrial Countersink Drill Bit | 5pc Set Tri-Flat Shank Quick Change 1/4"-3/4" High Quality M2 Steel Construction Gold and Black Finish 5 Flutes and 82 Degree Point Angle 1/4" Shank Fits Most Common Power Drills Sizes Include: 1/4", 3/8", 1/2", 5/8", 3/4"