JET Super Premium Cobalt Jobber Drill Bits

JET Super Premium Cobalt Jobber Drill Bits

SKU: 573420

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The JET Cobalt Super Premium Cobalt Jobber Drill Bits are heavy duty bits made for drilling hard tough metals: free machining stainless steel, high temperature alloys, titanium and certain plastics. Their high red hardness allow 30% higher drilling speeds over regular high speed steel drill bits.


  • 5/16"
  • 5/32"


  • Razor sharp 135° split point self centering tips, eliminating “walking” and the need for center punching
  • Superior bronze oxide (gold) ground flute finish reduces friction, translating to less operator pressure, and longer life
  • Special flute form enhances chip ejection, reduces drill retractions (woodpeckering) and improves coolant flow to the tip
  • For best results use in rigidly held positive feed drilling equipment