High quality, non-marking cart casters for Greenlee GMX carts. Listing is for a set of four (4) Service Caster Series #30 casters with 8 inch diameter by 2 inch wide polyurethane tread on polyolefin core wheels. Set includes four (4) swivel casters with bolt on swivel locks. Supports 4,000 total pounds (lbs) at 1,000 pounds (lbs) per caster. When searching for a reliable and durable solution to your Greenlee replacement caster needs, consider Service Caster Series 30 top plate polyurethane tread on polyolefin core wheel casters. The Service Caster Series #30 features polyurethane tread on polyolefin core wheels that offer a softer tread for smoother travel while also resisting flat spots and damage from debris. Finely crafted with a bright zinc plated finish and heat-treated ball bearing raceway, these Service Caster high performance Greenlee replacement casters balance high pay loads with smooth and quiet operation. These versatile casters are ideal for a wide range of applications, but are commonly used on Greenlee GMX Carts. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.