Back Home / Cutting Tools / Drill Bits / DRILL BIT COBALT 3/8 DRILL BIT COBALT 3/8 SKU: XTID38C Categories: Cutting Tools, Drill Bits Diameter of 3/8″. Jobber length, 5″. 135° split point. Cobalt, high speed steel Heavy duty construction. Works best in cast iron, low and medium carbon steel, high alloy steel and stainless steel. Diameter of 3/8″. Jobber length, 5″. 135° split point. Cobalt, high speed steel Heavy duty construction. Works best in cast iron, low and medium carbon Case Quantity: 1 Log In For Pricing