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Dual Stepped Bit HSS 6542 M2 19 Sizes Hex Shank 7/8 to 1-3/8" Inch Unibit Cone Metal Step Drill Bit, Find Details and Price about Diamond Polishing Pads Polishing Pads from Dual Stepped Bit HSS 6542 M2 19 Sizes Hex Shank 7/8 to 1-3/8" Inch Unibit Cone Metal Step Drill Bit - Danyang Ebuy Imp&Exp Co., Ltd.