#19 (0.1660) Diameter. 0.500" Working Length. 0.563" 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