High performance HSS drill bits. Heavy-duty large diameter drill bits for use on portable drills, drill presses, and magnetic base drills with 1/2″ chuck capacity.
Extra hard tip allows to drill many holes between re-sharpening.
Now made with cobalt blend for longer life.
118° self-centering split point geometry.
Special bronze SST surface treatment.
3 flats on shank.
Special heat treating process.