Blue Granite, 1" x 10" x 12", Hammer Drill Bit, 4 Grind Head, Delivers 2x More Cutting Angles For Longer Life & Faster Speed, Multi-Grind Carbide Centering Tip, Offers Accurate Starts In Brick, Masonry & More, Robust Bit Head, Provides Long Life In Impact Applications, Milled U-Flutes With Deep Cut Spirals, Delivers Fast Dust Removal.