Listing is for a set of four (4) Service Caster Series #30 stainless steel casters, two (2) swivel casters with side lock brakes & bolt on swivel locks and two (2) swivel casters with a side lock brakes, with 8" diameter by 2" wide nylon wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 5,000 lbs. (1,250 lbs./caster).