6-Piece Fractional Forstner Bit Set Includes 5/16'', 7/16'', 9/16'', 11/16'', 13/16'' and 15/16'' bits with 3/8'' round shanks. Wide flute openings allow for fast chip removal. Unique tapered rims help prevent burning. Bits have two bottom cutting edges that efficiently shear through wood. Comes in durable plastic case.