2-piece auto wheel dolly set, great for moving cars, boats, planes and more. These are not the standard dollies you’ll see everywhere else. The four 3 in. swiveling casters allow for omni-directional movement around the garage with ball-bearing construction for maximum performance. Design includes onboard brakes to limit movement once the vehicle is in position along with a 16 in. x 12 in. diamond-plated surface to reduce the risk of slipping.