STURDY CONSTRUCTION - The steel plate and 3-inch ball bearing locking casters of these sturdy vehicle tire dollies set of 4 offer a 6000 lbs bearing capacity for moving vehicles, lifting cars, or trucks, also positioning large loads for conserving space..SWIVEL CASTERS - The ball-bearing casters on each dolly allow you to rotate cars with a wide-ranging 360-degree swivel for easy movement in any direction, 2 of them are brakeable, making them ideal for auto repairs, car sales showrooms, or organizing the garage and furniture..ANTISKID CONCAVE SURFACE - The wheel dollies feature a heavy-duty and thick steel plate that is powder-coated which increases friction and prevents slip; Its recessed center works for balance and keeps the auto tire securely in place. Durable and rust-resistant; It will not bend or damage easily during use even with heavy objects on it..MULTIPLE FUNCTIONS: The wheel dolly has a convenient handle that makes it easy for you to carry or hang. It is a useful tool for garages, shops, showrooms, and restoration for cars, trucks, tractors, ATVs, lawnmowers, scooters, equipment, and so on..FOR KINDS OF CARS - The dimension of each steel plate is 15”L x 11.8W”; The diameter of casters is 3”; Weight Bearing Capacity is 6000 lbs in total, 1500 lbs each. Comes with 4 dollies. Please feel free to contact us if any concerns.