G1491 Jobber Drill Bit Material High Speed Steel Point Angle 135 Degrees Split Point Finish Black Oxide Dimension Type Letter Size K Decimal Equivalent 0.2810 In. Flute Length 2-15/16 In. Overall Length 4-1/4 In. List Number 150ASP Shank Dia 0.2810 In. Standards National Aerospace Standards (NAS) 907 Type B