Multi-Purpose Rotary Drill Bit, 5/16 in Drill - Fraction, 0.3125 in Drill - Decimal Inch, Carbide
3125 in Drill - Decimal Inch, 4 in Overall Length, 1/4 in Shank, Carbide Cutting Edge, Carbide, Applicable Materials: Concrete, Stone, Masonry, Ceramic Tile, Marble, Brick, Granite, Plastic, Glass, Wood, Fiberglass and Plexiglass.