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Product Description Caliber extra hard screwdriving bits are cut from high grade, shock absorbing alloy steel. Individually heat treated to guarantee an optimal hardness for wear resistance and less tip breakage. Designed for professionals where rugged use is required. Brass plated for easy identification and corrosion resistance. From the Manufacturer Century's Caliber Extra Hard screwdriving bits are cut from high grade, shock absorbing alloy steel. Individually heat treated to guarantee an optimal harndess for wear resistance and less tip breakage.