/caster. Listing is for one (1) Service Caster Series #20 stainless steel swivel caster with a 5" diameter by 1-1/4" wide soft rubber wheel and a 1/2"-13 X 1-1/2" threaded stem with total lock brake capable of supporting 275 lbs. When searching for a reliable and durable solution to your caster needs, consider Service Caster’s 316 stainless steel soft rubber casters.