The Ravelli ATD Tripod Dolly is an excellent dolly for use with your professional camera and video tripods, light stands, and background stands. The most important feature of a good dolly is good wheels. After all, the point of a dolly is to be able to smoothly move your tripod from one place to another. Unlike less expensive models with smaller plastic wheels, our dolly uses large 3" diameter wheels with all metal ball bearings and a rubber outer surface for an ultra smooth roll. The ATD also features one step easy locking wheels. Once you get the dolly where you want it, all you have to do is "step" on the locks for one or more of the wheels. The universal leg locks will fit nearly any tripod. The ATD has been designed with leg grips that slide along the dolly leg going either closer to the center or out to the end. This allows you to adjust the desired level of "spread" for the tripod you are using.