High Quality M2 Steel Construction Gold and Black Finish 5 Flutes and 82 Degree Point Angle 1/4" Tri-Flat Shank For Easy Grip 1/4" Shank Fits Most Common Power Drills Quickly and Easily Cuts Soft Metal, Wood, Rubber, Plastic and Other Machinable Materials Sizes Include: 1/4", 3/8", 1/2", 5/8", 3/4"