Listing is for one (1) Service Caster Series #20 swivel caster with total lock brake and a 5" diameter by 1-1/4" wide blue polyurethane wheel and 7/16" diameter x 1-3/8" length grip ring stem. Supports up to 350 lbs. per caster. 4615PCB 5PCB replacement part fits Metro Super Erecta mobile shelf posts, carts and shelving units. When searching for a reliable and durable solution to your Metro replacement caster needs, consider Service Caster Series 20 grip ring stem polyurethane tread on polyolefin core wheel casters. The Service Caster Series #20 features polyurethane tread on polyolefin core wheels that offer a softer tread for smoother travel while also resisting damage from debris. Finely crafted with a bright zinc plated finish and heat-treated ball bearing raceway, these Service Caster high performance Metro 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 Metro Super Erecta mobile shelf posts, carts and shelving units. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.