The SY America Heavy-Duty Plate Casters are a set of two rigid casters designed to support heavy loads with a total capacity of 1400 pounds. The casters are made with a durable polyurethane mold on steel material and feature a 2-inch wide wheel and 4-inch wheel diameter. They come with a top plate mounting system that measures 4"x4-1/2", with mounting over heights of 5-5/8". The casters have a green color and feature roller bearings with hardened raceways for extra strength. SY America offers a 90-day hassle-free return policy and 100% satisfaction guarantee for all products purchased.