135° Heavy-Duty Cobalt Jobber Length Drill Chicago-Latrobe 550ASP Straw HSS-CO 5%-M35 RHS/RHC 5/16Mfr #: 47720 Jobber length drill bit has a midrange drilling depth for general purpose applications Cobalt steel provides extended tool life compared to high speed steel drill bits when drilling hard materials Gold oxide finish lubricates and provides wear resistance on ferrous materials Self centering 135 degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging Thin web penetrates material easily,