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13/16 Cobalt Silver & Deming Split Point Drill Bit, S&D. M35 has 5% Cobalt, this is the difference between H.S.S. Steel and Cobalt High Speed Steel. you will need genuine cobalt alloy steel drill bits.
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.