Drill America D/AA/CX65/16 Premium Aircraft Extension Drill, 5/16 in Drill - Fraction, 0.3125 in Drill - Decimal Inch

Drill America Aircraft Extension Drill, Premium Quality, Series: D/AA/C, 5/16 in Drill Size - Fraction, 0.3125 in Drill Size - Decimal Inch, 6 in Overall Length, 3-3/16 in Cutting Depth, 2 Flutes, 3-3/16 in Flute Length, Round Shank, 135° Point, Split Point, Right Hand Cutting, HSS Cutting Edge, HSS, Black Oxide, Applicable Materials: Mild Steel. 135° split point is self-centering and reduces thrust. They have at black oxide surface treatment that is abrasion-resistant, reduces chip welding and improves chip flow.