Westward 5PLL9 Jobber Length Drill Bit These drill bits are available in standard sizes, measured in millimeters. They are coated with black oxide, which helps to retain lubricants, improving the bits' wear resistance and chip flow. It's important to note that black-oxide bits should only be used for drilling ferrous metals. The bits' spiral flutes are designed to remove chips as the bits drill into a workpiece. Additionally, these bits are equipped with a straight shank that can be installed into a drill chuck or a similar tool holder. Drill Bit Size / 2.50 mm Decimal Equivalent / 0.0984 Measurement System / Metric Material - Machining / High Speed Steel Finish - Machining / Black Oxide Drill Bit Point Angle / 118 ° Drill Bit Point Type / Conventional Point Coolant Fed / Non-Coolant Through Flute Type / Spiral Flute Length / 30.00 mm Cutting Direction / Right Hand Shank Type - Machining / Straight Overall Length / 57.00 mm Drill Length Class / Jobber Length Standards / Not Rated Material Grade - Machining / General Purpose Maximum Drilling Depth / 30 mm