Not to be confused with the concussive hammer action in a drill, an impact driver delivers rotational blows as well as linear to drive or loosen large screws while additionally forcing the bit into the screw head for improved grip. Providing considerably more torque than a standard drill driver, an impact screwdriver will drive screws quicker and more efficiently than any other tool. Ideal for jobs such as laying subfloors, building decking, or simply projects that require you to be driving hundreds of large screws. Impact wrenches are essentially the same machine but typically more heavy duty and have square drives for attaching sockets. Widely used in trades such as automotive repair, construction and product assembly to tighten or loosen nuts and bolts.