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4-12 mm HSS Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Cone Drilling Tools Set
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4-20 mm HSS Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Cone Drilling Tools Set
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4-32mm HSS Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Cone Drilling Tools Set