The DeWalt DW1612 is a 7/16" x 12" black oxide drill bit. The bit has parabolic flute design which improves chip ejection in metal and wood drilling applications. The Helix is 31º which minimizes the over aggressiveness of a true parabolic flute. 135º split point drills on contact and prevents walking. It drills through wood, plastic, metal and heat–treated steel and it cut cooler, stay sharper longer. Perfect for heavy–duty fleet mechanics.