9/32" x 4-3/8", Multi-Purpose Drill Bit, Rotary Or Percussion Drilling, Tungsten Carbide & Cobalt Tip, Maximum Hardness & Resistance To Wear, Drills Through Concrete, Masonry, Ceramic Tile, Brick, Fiberglass, Plexiglass, Glass, Cast Iron, Hardened Steel, Granite, Marble & Wood,.