Screw Machine Drill Bit Standard List Number 159 Number of Pieces 1 Heavy Duty Grade High Speed Steel Black Oxide Finish Split Point Drill Point (Deg.) 135 Fractional Size (In.) 13/64 Decimal Equivalent 0.2031 Flute Length (In.) 1-3/16 Overall Length (In.) 2-1/4 Shank Dia (In.) 13/64 For Alloy Carbon And Tool Steels And Cast Iron Meets/Exceeds National Aerospace Standards (NAS) 907 Type C