Listing is for four (4) Service Caster Series #20 swivel caster set with 4 top lock brakes and a 5" diameter by 1-1/4" wide polyolefin wheels and 3/4" diameter x 2" length square stems. Supports up to 300 lbs. per caster. 600CASTPRE4P replacement part fits Regency unassembled end load sheet pan racks. When searching for a reliable and durable solution to your Regency replacement caster needs, consider Service Caster Series 20 square stem polyolefin wheel casters. The Service Caster Series #20 features polyolefin wheels that have a high resistance to shock and impact damage while also being non-marking protecting floors. Finely crafted with a bright zinc plated finish and heat-treated ball bearing raceway, these Service Caster high performance Regency replacement casters offer polyolefin wheels that are best used on smooth, flat, and clear industrial or commercial settings where materials may be stationary for long periods. These versatile casters are ideal for a wide range of applications, but are commonly used on Regency unassembled end load sheet pan racks. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.