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Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs) - Amazon.com
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Owl Tools 1/2" Cobalt Drill Bits - 3 Pack - 6" Length - M35 Cobalt Drill Bits with Storage Case - Perfect Drill Bits for Metal, Hardened & Stainless Steel, Cast Iron, and More! - Amazon.com
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