Alfa USA Jobber Length 3-Flat Shank Fractional Drill Bit, 5/16" Diameter, 0.3125 Decimal Equivalent, 3-3/16" Flute Length, 4-1/2" Overall Length, High Speed, Black Oxide Finish, 135° Split Point, Straight Shank, Heavy Duty, Right Hand, Made in USA, 6 per