CO-Z 10 Sizes Titanium Step Drill Bit, 1/4 to 1-3/8 Inches High Speed Steel Drill Cone Bits for Sheet Metal Hole Drilling Cutting, HSS Multi Size Hole Stepped Up Unibit for DIY Lovers Electrician sold2025 Sharp grinding

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CO-Z 10 Sizes Titanium Step Drill Bit, 1/4 to 1-3/8 Inches High Speed Steel Drill Cone Bits for Sheet Metal Hole Drilling Cutting, HSS Multi Size Hole Stepped Up Unibit for DIY Lovers Electrician sold2025 Sharp grindingCO Z 10 Sizes Titanium Step Drill Bit, 1 4 to 1 3 8 Inches High Speed Steel Drill Cone Bits for Sheet Metal Hole Drilling Cutting, HSS Multi Size Hole Stepped Up Unibit for DIY Lovers Electrician Convenient & Accurate Laser engraved reference marks on each bit offer superb convenience and accuracy, ideal for drilling large and small diameter holes in metal and plastic. For high efficient drilling, thickness of sheet metal shall be less than that of