Titanium Nitride coated drill bit - 5/16".TiN coated jobbers length - 639/637 series.135 degree split point begins drilling immediately minimizing bit "walk".Titanium nitride coating, this gold colored coating lasts up to six times longer than standard high speed steel drill bits.Reduces friction, very wear resistant.Coating is very hard, approximately 80 Rockwell C (25% harder than Cobalt).Ideal for production work or repetitive drilling.
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