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HSS Drill Bits with 8% Cobalt, Long Life, Precision Drilling for Metal. Superior Hardness: Hardness of 64-67 HRC offers 3x wear resistance compared to standard HSS. Wide Material Compatibility: Suitable for steel, stainless steel, cast iron, aluminum, copper, and plastics. Customizable Coatings: Offers TiN, TiAlN, TiC, or uncoated options tailored to specific needs. Fast Sample Delivery: Samples delivered within 3-7 workdays via express couriers. Bulk Delivery Options: Bulk orders shipped in 7-30 workdays by air or sea freight. Diverse Size Range: Available in metric (from 0.5mm) and imperial (from 1/64 inch) sizes.