When drilling low tensile strength materials. When drilling low tensile strength materials, the Type "D" cobalt drill will have a significantly greater tool life than the NAS 965 Type B high speed steel adapter drill, resulting in a much lower cost per hole. #49 Cobalt Long Threaded Shank Drill Bit Overall Length 2-1/8.
When drilling low tensile strength materials. 9/64in Cobalt Short Threaded Shank Drill Bit Overall Length. When drilling low tensile strength materials, the Type inDin cobalt drill will have a significantly greater tool life than the NAS 965 Type B high speed steel adapter drill, resulting in a much lower cost per hole.