5/16" x 12" HSS Aircraft Extension Drill Bit D/AA/CX125/16

Size: 5/16, Material: High Speed Steel, Finish: Black Oxide, Flute Length: 3-3/16, Overall Length: 12, Shank Type: Round, Style: Aircraft Extension, Cutting Angle: 135, Point Type: Split Point, Number of Flutes: 2, Cutting Direction: Right Hand Manufactured to Aerospace Standard 907. The 135 degree split point is self-centering and reduces thrust. Ideal for drilling in mild steel where extra length for reach is required. They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow. Sizes smaller than 1/16 and #52 have the 118 degree standard point.