There are many different types of auto dolly carts out there on the market today. Many cheap, flimsy options are available. They may all look similar, but once you attempt to roll your automobile, you'll find that there is a difference. Don't sacrifice quality when purchasing such an important item for your garage. These heavy duty automotive carts are very maneuverable with their ball bearing caster wheels. Plus, the wheels are a healthy 3.5" diameter, made to roll smoothly over minor cracks and imperfections in your garage floor. Made to roll your prized hobby car, boat and trailer combo, or any vehicle for that matter. No need to start the vehicle up and drive it into position. Helps keep your garage well organized. Get 1 set for a boat or trailer, and 2 sets for autos.