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DIN338 HSS Edge Ground White Finish Twist Drill Bit. Wide Size Range: Available in sizes from 0.2mm to 20mm, with standard range up to 30mm. High Hardness: Rockwell hardness reaches HRC 60-68 for superior durability and cutting performance. Customizable Surface Finish: Options include Black, White, Coffee, Tin-coated, Amber, and Rainbow finishes. Multiple Shank Types: Offers Straight, Taper, 1/2 Shank, and other specialized shank configurations. Fast Sample Production: Samples can be produced within 3 to 7 days for quick testing. Global Export Experience: Direct manufacturer with 15 years of experience exporting to over 20 countries.