This hydraulic car wheel dolly jack set includes 4 skates with a total capacity of 6,000 lbs (1,500 lbs per dolly). Each 12-inch wheel vehicle positioning jack allows you to lift and move cars in tight spaces such as garages, workshops, or auto repair shops.The easy release foot pump provides hydraulic lifting and controlled lowering. Once the wheels are lifted, the dollies allow you to slide or rotate the vehicle for tire repair, brake work, detailing, or repositioning.These car skates are intended for professional and residential garage use on level concrete surfaces. For best results, use all 4 dollies together under each wheel. Do not exceed 1,500 lbs per dolly. Always engage parking brake and use wheel chocks on non-lifted wheels.Periodically inspect hydraulic components for leaks and casters for debris. Clean after each use.Whether you need to move a car for tire repair, reposition a vehicle in a tight garage, or add mobility to a non-running car, this set of 4 hydraulic car wheel dollies with foot pump offers a heavy duty and efficient solution.