Green Poly on Steel Caster

Listing is for a set of four (4) service caster series #30 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 polyurethane on cast iron wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 2,800 lbs. (700 lbs./caster).