Whatever you are building needed to be on wheels, here come the 4inch-Swivel-Caster-023. This caster is rolled on a wheel that has 100mm diameter/3.937" inch inches. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 124mm = 4.882" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 138mm x 110mm x 10mm and holes distance of 110mm x 75mm. The Precision double ball bearing design will enable the Cast iron polyurethane tire to roll easily with a core made of Cast iron polyurethane. Each caster will carry the load of 772 lb and is Swivel type. Temperature range = -40 to 180 F. Enjoy our 4inch-Swivel-Caster-023, we wish all the best in your project.