This set of Four Auto Dollies will help you maximise your available storage space. Easily move a project vehicle iin any direction. Each dolly measures 12in. x 16in.. Constructed of 1/4in. steel with 1-3/4in. diameter by 1-3/4in. wide composite wheels with ball bearing castors. Each dolly supports 1500 lbs. (6000 pounds total). Made in the USA.