YG-1 Aircraft Extension Drill, Imperial, Series: D1635, U Drill Size - Letter, 0.368 in Drill Size - Decimal Inch, 12 in Overall Length, 3-5/8 in Cutting Depth, 2 Flutes, Spiral Flute, 3-5/8 in Flute Length, 0.368 in Shank, 135 deg Point, Split Point, Right Hand Cutting Direction, HSS Cutting Edge, HSS, Steam Oxide, Applicable Materials: Carbon Steel, Alloy Steel and Pre-Hardened Steel