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Listing is for a set of four (4) Service Caster Series #20 casters, four (4) swivel 3/8"threaded stem casters with top lock brakes, 5â diameter by 1-1/4â wide phenolic wheels. Mounting options include top plate, bolt hole and standard and metric threaded stem sizes.Service Caster is unsurpassed in quality, reliability, and excellent customer service. When searching for a reliable and durable solution to your caster needs, consider Service Casterâs Series 20 soft rubber casters.