2618-0539 Features: -135 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.-Carded. Specifications: -Helix is 31 which minimizes the over aggressiveness of a true parabolic flute. Dimensions: -12'' length.-5/16'' diameter, 5/16'' shank.