DrillAmerica - DAM13X1/4 1/4 x13 CarbideTippedMasonryDrillBit Dam Series...Drill America - DAM13X1/4 1/4 x 13 Carbide Tipped Masonry Drill Bit Dam Series - Carbide-tipped tools feature cutting edges of carbide for wear resistance and a steel shank for toughness - Black oxide treatment adds lubricity and creates small pockets...more