39 X 6″ Aircraft Extension Drill Cobalt

• Cobalt drills offer increased hardness, toughness and better wear resistance compared to regular HSS
• Gold Oxide surface finish provides a polished finish and prevents chip building, galling and welding on a workpiece
• 135° split point for fast penetration and accurate starting (self-centering) which eliminates “Walking” and reduces the thrust force needed
• Longer Overall Length but Shorter Flute Length for maximum rigidity
• Used where extra reach is required or for drilling holes in hard-to-reach places
• Ideal for low carbon, stainless steel and other ferrous metals