High quality, non-marking cart casters for Greenlee GMX carts. Listing is for a set of four (4) Service Caster Series #30 casters with 6 inch diameter by 2 inch wide polyurethane tread on polyolefin core wheels. Set includes four (4) swivel casters. Supports 3,600 total pounds (lbs) at 900 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.