DEWALT DW1629 1-Inch 1/2-Inch Reduced Shank Twist Drill Bit,Black

1IN HSS 1/2IN DRILL BIT 135 degree split point drills on contact and prevents walking Parabolic flute design improves chip ejection in metal and wood drilling applications Black oxide coated for greater wear resistance Helix is 31 degrees which minimizes the over aggressiveness of a true parabolic flute