If a technician needs to remove or install a tire from a vehicle near the ground, the patented TRAC TireJack simply slides under the tire and carries it off or on the vehicle. There is no need to lift with your back while using the TIREJACK. Just raise the vehicle from the ground with a floor jack. Place the TIREJACK under the tire and using leverage simply lift the tire away from the vehicle. Installation is just as easy with simply lifting the tire, rolling the tire to align with the wheel hub, and sliding it on. Work Smarter not harder, use the jack-not your back.