High-quality drill bit material: Made of industrial-grade M35 high-speed steel with 5% cobalt added,it generally has better heat resistance,wear resistance and chip resistance,and long tool life. Features: Round straight shank,Self-centering design prevents walking,fully ground twist design ensures a drilling performance by decreasing friction,easily for drilling materials includs stainless steel,cast iron,Alloy,Wood and hard plastics.
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