An impact tool includes a housing, a motor supported within the housing, and a drive assembly supported within the housing and configured to convert a constant rotational force provided by the motor into a striking rotational force, the drive assembly including an anvil assembly and a hammer configured to deliver the striking rotational force to the anvil assembly. The anvil assembly includes a plurality of interchangeable drive members, each drive member having a shaft portion and a head portion extending from the shaft portion and configured for coupling to a tool element, and an anvil member having a bore configured to receive the shaft portion of a selected drive member of the plurality of interchangeable drive members. The bore and the shaft portion include cooperating spline patterns such that the selected drive member is coupled for co-rotation with the anvil member when received in the bore of the anvil member.