Jobber Length Drill Bit, Drill Bit Size 27/64 in, Drill Bit Point Angle 135 Degrees , High Speed Steel, TiN, Decimal Equivalent 0.4219, Fractional Inch, Drill Bit Point Type Split Point, Non-Coolant Through, Number of Coolant Holes 0 These drill bits meet National Aerospace Specification (NAS) 907 Type B. They have a TiN coating that protects them from wear and heat when drilling steel, stainless steel, and aluminum.These high-speed steel jobber-length drill bits meet National Aerospace Specifications (NAS) for drill bits used in aircraft production and repair. These drill bits do not have coolant holes, so a separate hose is required to bring coolant to the bits' tip if it is needed. The bits are made from high-speed steel. They provide more flexibility and absorb more shock and vibration.