A set of six 1/4 inch by 6 inch aircraft extension drill bits designed for drilling deep holes or accessing hard-to-reach areas. Made from premium high-speed steel M2, these fully ground drill bits deliver impressive cutting performance in metal, plastic, and wood. The 135-degree chisel angle with split point provides accurate starts without walking. Precision treatment enhances durability and corrosion resistance while ensuring smooth drilling. Conforms to ASME/ANSI B94.11M and USCTI drill standards.