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Allows drills or impact drivers to drive hanger bolts and threaded rods Internal threads and ball shaped stop at base of hanger bolt driver allow for easy thread release Alloy-Steel for extra strength and durability Built to withstand the high torque (rotational force) of impact drivers, Impact Plus (Registered Trademark) Thread Size: 1/4" - 20, Length: 1-5/8", Shank: 1/4" hex power