ARTU Tungsten Carbide Tipped Drill Bit Set Round Shank 7 Pc

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.Resharpens on a high quality silicon carbide grinding wheelSet includes 1 each: 1/8″, 3/16″, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″For use on glass, plexiglass, ceramic tile, cast metal, hardened steel, soft wood, hard wood, granite, marble, fiberglass, brick, masonry, concrete and PVCFor rotary or percussion drillingSpecial negative back grinding enables the tip to bore through materials with a filing action, not cuttingCobalt and tungsten carbideChrome vanadium steel shank has enormous strength and flexibilityFlat bottom parabolic flute for faster waster removalWorks ideally for cordless drills, corded drills and drill pressesRequires no center punch – eliminates walking