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Irwin 14167 7/16" x 6" Speedhammer Plus SDS Drill Bits 2pcs.PATENTED TIP AND FLUTE DESIGN REMOVES DUST MORE EFFICIENTLY.CHROM VANADIAM SHAFTSHOT-PEENED, DOUBLE TEMPERED FINISH REDUCES BREAKAGECOPPER BRAZE MATERIAL GIVES HIGH HEAT RESISTANCEFITS ALL SDS-PLUS AND HILTI TE-C ROTARY HAMMERS