3 X 1 1/4 Premium Rubber/Polyolefin Flat Tread Wheel With Annular Bearing Swivel Caster Plate Mount. Double Ball Raceways Offer Improved Swiveling Action And Durability. Standard Zinc Plated Finish Is Attractive And Corrosion Resistant. Fork And Leg Asembly Designed And Formed For Maximum Durability And Long Term Service.