YG-1 Aircraft Extension Drill, Series: D1631, 1/4 in Drill Size - Fraction, 0.25 in Drill Size - Decimal Inch, 6 in Overall Length, 2-3/4 in Cutting Depth, Slow Spiral Flute, 2-3/4 in Flute Length, 1/4 in Shank, Straight Shank, 135 deg Point, Split Point, Right Hand Cutting, HSS Cutting Edge, HSS, Steam Oxide, Applicable Materials: Alloy Steel, Aluminum, Bronze, Carbon Steel, Cast Iron, Mild Steel, Prehardened Steel, Stainless Steel and Titanium