5/16 x 4-1/2-In. Multi-Purpose Drill Bit

5/16″ x 4-1/2″ multi purpose drill bit, cobalt and tungsten carbide tip for maximum hardness and resistance to heat and wear, for rotary or percussion drilling, for use with masonry, concrete, brick, marble, granite, hardened steel, cast metal, fiberglass, plexiglass, ceramic tile, hard wood, soft wood and glass.