U.S. AIRMOTIVE GSE offers two of the most common type of casters, the 401-N for your dollies and the 325-N for your loaders, both are stock items. The casters have a 3.5mm fork, 1/2 mm thicker than most casters. This thickness provides additional strength and in turn adds extra life to the caster. Also features diamond base plate; double ball race; sealed wheel bearing and nylon wheel configuration.