'Screw Machine Drill, Aircraft, List Number 159, Number of Pieces 1, Heavy Duty Grade, High Speed Steel, Black Oxide Finish, Split Point, Drill Point (Deg.) 135, Wire Size #9, Decimal Equivalent 0.1960, Flute Length (In.) 1-3/16, Overall Length (In.) 2-1/4, Shank Dia. (In.) 0.1960, For Alloy, Carbon And Tool Steels And Cast Iron, Meets/Exceeds National Aerospace Standards (NAS) 907, Type C'