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Technical Info for Jobber Length Drill Bits (HSS-Co 5) - Inch & Metric size
RUKO jobber length twist drill bits provide fast and clean cutting for a variety of materials such as steels, irons and aluminum alloys. Fully ground for more precise concentricity, these 5% cobalt high-speed steel (HSSE-Co5) drill bits are available in sizes up to 1/2 inch (Imperial) or 13mm (metric), and are the best choice for difficult stainless steels.