Overview Reviews Product Description Cobalt jobber drills offer increased hardness, toughness and better wear resistance compared to regular HSS 135° Degree split point (self-centering) which eliminates "walking" and reduces the thrust force needed Titanium nitride (TiN) coating increases wear and heat resistance while improving chip flow and higher lubricity Parabolic flute design facilitates effective chip evacuation for deeper hole drilling Suitable for steel, stainless steel Clarkson Osborn Catalog Product Videos Custom Field Diameter 3.9mm Flute length 43mm Overall length 75mm Package quantity/sold as each 10 Product Reviews Write a Review Write a Review × Clarkson-Osborn 3.9mm TiN Coated Cobalt Parabolic Flute Jobber Drill Bit DR11839 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *