Master Mechanic, 5/16" x 4", Masonry Drill Bit, 1/4" Shank, Positive Point Angle Permits Quick, Accurate Penetration, Zinc Surface Finish, Recommended For Drilling Cinder Block, Common Brick, Plaster & Ceramic Tile & For Moderate Use In Hard Brick, Glazed Tile & Dry Concrete, Carded.