Artu #01010 1/8'' X 2-5/8'' L Tungsten Carbide Tipped Drill Bit (5-PACK) The special negative back grinding enables the tip to bore with a filling action, not cutting and chrome vanadium steel shank for enormous strength and flexibility. The blend and high tech bonding of cobalt and tungsten carbide allows bit to withstand temperatures up to 2000 degree.. For use on glass, plexiglass, ceramic tile, cast metal, hardened steel, soft wood, hard wood, granite, marble, fiberglass, brick, masonry, concrete and PVC. Conforms to ANSI standards. For rotary or percussion drilling. Special negative back grinding enables the tip to bore through materials with a filing action, not cutting. Cobalt and tungsten carbide tip allows bit to withstand temperatures up to 2000 degrees F. Chrome vanadium steel shank has enormous strength and flexibility. Flat bottom parabolic flute for faster waster removal. Works ideally for cordless drills, corded drills and drill presses. Requires no center punch - eliminates walking. Resharpens on a high quality silicon carbide grinding wheel. ANSI Approved Chrome vanadium steel shank