Master Mechanic, 14 x 6, Rotary Percussion, Masonry Drill Bit, Black Oxide, Carbide Tipped, Designed For Use In Drills With Rotary Or Hammer Mode, Recommended For Drilling Cinder Block, Common Hard Brick, Plaster, Ceramic Tile, Glazed Tile Wet Or Dry Concrete For Moderate Use In Marble, Granite Concrete Over 6000 PSI, Carded