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Shars 5PC 4" Long HSS 6542 Center Drill Set 60° Combined Countersink #1,2,3,4,5 New. HRC of HSS 6542 (W6Mo5Cr4V2)is 67~70. And HSS 6542 has a good red-hardness and retains its cutting edge sharpness longer than other general purpose high speed steel.
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