Irwin Model 3016132, Cobalt Drill Bit, 1/2" X 6" With 3/8" Reduced Shank
Fractional, Jobbers Length. Straight Shank. 135 degree split point begins drilling immediately, minimizing bit ``walk". Heavy-duty web construction for strength and durability. 8 per cent cobalt for much higher hot hardness and abrasion resistance. Recommended for drilling hardened steel, super alloys, titanium and stainless steel.
COBALT - GOLD OXIDE