GUHRING 9005490086100 Jobber Bit, R, High Speed Steel. More details: Parabolic Jobber Drill Bit, Dimension Type Letter, Size R, Material High Speed Steel, Flute Length 3-7/16 In., Coolant Through No, Finish Steam Nitride, Point Angle 130 Degrees , Overall Length 4-7/8 In., Decimal Equivalent 0.3390 In., Shank Dia. 8.61mm, List Number 549, Cutting Direction Right Hand, Point Type Notch Point