82 Degree Heavy Duty Industrial High Speed Steel Countersink Drill Bit Set and Deburring Tool Set,5 Pieces High Quality HHS4231 Material Construction 5 Flutes and 82 Degree Point Angle Size: 1/4", 3/8", 1/2", 5/8", 3/4" 1/4" Tri-Flat Shank For Easy Grip Cut Quickly and Easily in Soft Metal, Wood, Rubber, Plastic and Other Machinable Materials