ellismanufacturing.com VS.

rigging.com

Country of Origin: Made in the USAApplication: Allows movement in any direction of cars, trucks, planes, helicopters, boats, trailers, pipes, or other industrial loads.Description: Place a low-profile, center creased dolly under each corner of the load for effortless rolling in any direction, even sideways. Swiveling 360 degree casters have mar-resistant polyolefin wheels featuring a crown profile that provides less rolling resistance against the ground. The rugged 1/4" steel plate deck has a durable painted finish. NOTE: Dollies require some assembly. Casters must be securely tightened.Caster Type:Polyolefin: A floor protective, hard tread wheel that withstands hard impacts while being lightweight. Non-marking, non-conductive, and resistant to water, oils, grease, solvents, and many chemicals.Set Includes: (2) two individual dolliesWARNING: Never exceed rated capacity!