Listing is for one (1) Service Caster Series #30 rigid caster with a 4" diameter, 2" wide polyurethane tread set on a polyolefin core wheel. Supports 600 pounds (lbs) per caster. Non Marking/Non Marring. Introducing Service Caster's replacement caster, a perfect alternative to the McMaster Carr caster 20115T22. When searching for a reliable and durable solution to your caster needs, consider Service Caster Series 30 top plate polyolefin wheel casters. The Service Caster Series #30 features light weight polyolefin wheels that are resistant to shock, chemicals and abrasion, and finely crafted with a bright zinc plated finish and heat-treated ball bearing raceway. These versatile casters are ideal for a wide range of applications, such as dollies, platform trucks, warehouse carts and freight terminals. Or ensure a smooth and secure ride for food service carts, hotel housekeeping carts, and industrial and commercial equipment. Even drywall carts, welding carts, and wall panel carts will be ready to roll on the Series 30, keeping you moving forward. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.