The special negative back grinding of the ARTU 5/16 in. X 4-1/2 in. L Tungsten Carbide Tipped Drill Bit Quick-Change Hex Shank 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.
