3Pcs Step Drill Bit HSS Hexagonal Shank Straight Groove Black Step Drill Bit 3-12/4-12/4-20/4-32mm Reaming Tower Drill Tool Set

3Pcs Step Drill Bit HSS Hexagonal Shank Straight Groove Black Step Drill Bit 3-12/4-12/4-20/4-32mm Reaming Tower Drill Tool Set

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