?5% cobalt-alloyed jobber drills with an extremely sturdy construction (re-inforced web) for drilling under difficult conditions e. g. poor chip removal and deep holes, for use in steel and cast-iron with tensile strength up to 1.300 N/mm?.?Strengths?Self-centeringSpecial point shapeHarderNitro-oxidised chamferDeep hole twist drillBig chip spaces (6 to 8 x D)Faster by special drill geometryHighly accurate centering