USA Big Stocks Center We are an authorized Artu USA dealer. All our items are Brand new in original package, ARTU USA CONCRETE SCREW BIT 5/16" X 6-1/4" #01041 Multi-Purpose Drill Bit For Rotary or Percussion Drilling For use on Glass, Granite, Plexiglass, Marble, Ceramic Tile, Fiberglass, Cast Metal, Brick, Hardened Steel, Masonry, Soft Wood, Concrete, Hard Wood. Chrome vanadium steel shank for enormous strength and flexibility. Ideal for cordless drills, corded drills and drill presses. Flat bottom parabolic flute for faster waste removal. Special negative back grinding enables the tip to bore through materials with a filing action, not cutting. Outlasts regular carbide tipped bits. No center punch needed, eliminates walking. Resharpen on a high quality silicon carbide grinding wheel. Conforms to ANSI standards. Coolants: turpentine, light oil, water. Product description Multi-Purpose Drill Bit For Rotary or Percussion Drilling For use on Glass, Granite, Plexiglass, Marble, Ceramic Tile, Fiberglass, Cast Metal, Brick, Hardened Steel, Masonry, Soft Wood, Concrete, Hard Wood. Chrome vanadium steel shank for enormous strength and flexibility. Ideal for cordless drills, corded drills and drill presses. Flat bottom parabolic flute for faster waste removal. Special negative back grinding enables the tip to bore through materials with a filing action, not cutting. Outlasts regular carbide tipped bits. No center punch needed, eliminates walking. Resharpen on a high quality silicon carbide grinding wheel. Conforms to ANSI standards. Coolants: turpentine, light oil, water. If you will have any questions, please contact us. Shipping out of the USA is via USPS First Class or Priority Airmail. (International buyers might have to pay additional custom tax / import fees in their country) Thank you very much, happy bidding / buying and good luck!