Relton GRT-5-6 5/16" X 4" DD Carbide Granite Drill Bit with 1/4" Shank Groo-V Tip

DIAMETER: 5/16" SHANK DIAMETER:1/4" OVERALL LENGTH:6" DRILL DEPTH:4" PART#:GRT-5-6 Specially designed for drilling Extra-Hard materials, this modified ram tip bit has a serrated-edge carbide allowing it to penetrate much faster than a standard masonry bit. When drilling hard-metal, it is best to use the bit in a drill press or in a drill motor supported to provide steady drilling speeds under load. Use on Materials: Tile, Hard Metal, Plastic, Wood, Marble, Granite, Masonry.