Listing is for a set of four (4) Service Caster Series #KP30 casters, two (2) swivel casters with side lock brakes & bolt on swivel locks and two (2) swivel casters with a bolt on swivel locks, with 4" diameter by 2" wide high temperature phenolic wheels capable of supporting a total weight of 3,200 lbs. (800 lbs./caster).