CHICAGO-LATROBE 49229 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.) 29/64 Decimal Equivalent 0.4531 Flute Length (In.) 2-1/8 Overall Length (In.) 3-9/16 Shank Dia. (In.) 29/64 For Alloy Carbon And Tool Steels And Cast Iron Meets/Exceeds National Aerospace Standards (NAS) 907 Type C