VersaDrive Heavy Duty Impacta-Drill Taps are primarily designed to be adapted for use with a reversible Magnet Drill to drill and tap heavy plate in 1 easy operation. However, they can also be adapted for use with an impact wrench to enlarge and tap existing holes. Due to the high rotational torque generated by larger thread sizes, Heavy Duty Impacta-DrillTaps are not recommended for use in a standard drill chuck. Highly accurate ground twist drills creates the perfect tapping hole. Safer tapping with minimal kickback specially hardened for impact wrench use. Very high grade tool steel with ground flutes for high accuracy and long service life. Gold max low friction titanium coating to stop heat burnout. High strength, non slip 11mm hex shank design.