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For rotary or percussion drilling. Chrome vanadium steel shank; diamond ground tip; special negative back grinding enables tip to bore through brick; concrete; masonry; ceramic tile; fiberglass; plexiglass; glass; cast metals; hardened steel; granite; marble, woods, and plastic with a filing action. High tech bonding allows bit to withstand drilling temperatures up to 2,000 degrees Fahrenheit. Easy to resharpen. Includes (one each): 1/8", 3/16", 1/4", 5/16" and 3/8" and plastic case. NOTE: Not recommended for use on mild steel. This includes aluminum, angle iron, copper, galvanized pipe, brass and stainless steel. Packaged in a plastic case.