Check the listing for details. CHICAGO-LATROBE 46683 Jobber Drill,#13,Cobalt 1G941. Condition: New. Listed at 6.67 USD. Jobber Length Drill Bit, Drill Bit Size #13, Drill Bit Point Angle 135 Degrees , Cobalt, Straw/Bronze, Decimal Equivalent 0.1850, Wire, Drill Bit Point Type Split Point, Non-Coolant Through, Number of Coolant Holes 0 These drill bits meet National Aerospace Specification (NAS) 907 Type J for drill bits used in aircraft repair and production. They have a have a straw/bronze finish that improves their wear resistance, and they have spiral flutes that evacuate chips as the bits drill into a workpiece.Cobalt jobber-length drill bits tolerate higher drilling speeds and are harder and more wear-resistant than high-speed steel drill bits. They provide some shock absorption and can be used in handheld power tools. Jobber-length drill bits are the most commonly used drill-bit length. They provide a.