#21 (0.1520) Diameter. 2.400" Working Length. 3.000" Body length. 1/4-28 thread. Made of extra durable Cobalt Steel.
THREADED DRILL BITS
Specifications: 135° split-point angle prevents walking . 1/4-28 threaded shank . Surface treated to resist abrasion and minimize tendency of soft metals to load drill, making it ideally suited for drilling Aluminum and mild Steel