VersaDrive Heavy Duty Impacta-DrillTaps 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 the high rotational torque generated by larger thread sizes, Heavy Duty Impacta-DrillTaps are not reccomended for use in a standard drill chuck. Ground Flute Twist Drill Creates the perfect Tapping Hole. Safer Tapping with Minimal Kickback; specially hardened for impact wrench use. High Grade Tool Steel with ground flutes for high accuracy & long life. GoldMax low friction Titanium Coating to stop heat burn out. High Strength, Non slip shank design.