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When buying a premium cobalt drill bit, one of the most important points is what type of cobalt steel the bit is made of. RMT drill bits use M42 steel. Most less expensive drills use M35 which is not as good.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.