• For rotary or percussion drilling • Chrome vanadium steel shank with cobalt and tungsten carbide tip that withstands temperatures up to 1900 degrees Fahrenheit • Special negative back grinding enables tip to bore through applications such as masonry, ceramic tile, concrete, brick, fiberglass, plexiglass, cast metals, hardened steel, granite, marble, woods, and plastic with a filing action rather than a cutting act • No center punch required; eliminates walking and can be re-sharpened • For use in cordlessdrills and corded drills • NOTE: Not recommended for use on mild steel • This includes aluminum, angle iron, copper, galvanized pipe, brass and stainless steel. • Dia x OA Lgth In=1/4 x 16