Stop wheel hop and vibrations on hub piloted wheels! Hub pilot hole diameter tolerances can allow wheels to be installed and and tightened in an "off center" or clocked position. Designed for UD and Volvo trucks with Hungarian made Alcoa wheels (26.0mm stud holes), the 3 piece 32116 threadless wheel centering tool set slides directly over the wheel studs in the 12, 4, and 8 o'clock positions. The wheel is then installed over the tools, and the stud nuts added to the exposed nuts and tightened. The wheelis now centered precisely. The centering tools are removed and the final stud nuts are installed. California Residents WARNING