U (0.3680), 135 degree split point. High speed steel. 6" Aircraft Extension series 1 lbs (0.5Kg) shipping weight.
6" AIRCRAFT EXTENSION DRILL BITS (LETTER SIZES)
Specifications: 135° split-point angle prevents walking (A) . Surface treated to resist abrasion and minimize tendency of soft metals to load drill, making it ideally suited for drilling Aluminum and mild Steel . Made of High Speed Steel (HSS) . Meets NAS907 Type B and J standards