Irwin Aircraft Extension Aircraft Extension 1/4 in. Dia. x 12 in. L Black Oxide Split Point DrilIrwin Aircraft Extension Aircraft Extension 1 4 in. Dia. x 12 in. L Black Oxide Split Point Dril Brand Name: Irwin Sub Brand: Aircraft Extension Diameter: 1 4 in. Overall Length: 12 in. Material: High Speed Steel Product Type: Split Point Drill Bit Shank Type: Straight Shank Number in Package: 1 pc. Finish: Black Oxide Packaging Type: Carded Design: Aircraft Extension Flute Length: 2 3 4 in. Ideal for drilling in hard to reach areas and for running