Westward Jobber Length Drill Bit The TiN coating on these drill bits protects them from wear and heat when drilling steel, stainless steel, and aluminum. Parabolic-flute drill bits have wide, deep flutes that improve chip flow and heat dissipation, so feed rates do not need to be reduced as the drills move deeper into the workpiece. These bits have a straight shank that installs into a drill chuck or similar tool holder. Drill Bit Size / 3.50 mm Decimal Equivalent / 0.1378 Measurement System / Metric Material - Machining / High-Speed Steel Finish - Machining / TiN Drill Bit Point Angle / 135 ° Drill Bit Point Type / Split Point Coolant Fed / Non-Coolant Through Flute Type / Parabolic Flute Length / 39.00 mm Cutting Direction / Right Hand Overall Length / 70.00 mm Drill Length Class / Jobber Length Standards / Not Rated Maximum Drilling Depth / 39 mm