Aircraft drill bits. Aircraft extension drills are surface treated high speed steel with 135 degree quick-cut points that will not walk or wander. Designed for drilling through materials less than 4 thick. Extension drills are used in areas where extra reach is important. Product Features:Designed for drilling through materials less than 4-Inches thickExtension drills are used in areas where reach is importantAircraft extension drill bits are surface treated high speed steel with 135 Degree quick-cut points that will not walk or wanderOverall length is 12 inches
