GoolRC 3pcs HSS Step Drill Bit Set 4-32mm 4-20mm 4-12mm Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Drill Bit Set Metric

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GoolRC 3pcs HSS Step Drill Bit Set 4-32mm 4-20mm 4-12mm Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Drill Bit Set Metric