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GOOD QUALITY,5PCS,5/16", HSS Black Oxide Twist Drill Bits, Metal drill, ideal for drilling on mild steel, copper, Aluminum, Zinc alloy etc. *High Quality Material- High Speed Steel, Best Material.*High Efficiency In Drilling Metals, and Stainless Steel.*Ideal for drilling in tough metal, including heavy-duty abrasive alloy metal drilling on hardened steel.*118-degree split-point tip starts drilling immediately with less force and eliminates "walking" across the work surface.