4 Piece Poly Cast Iron Caster Set with 2 Brakes and 2 Rigids

The listing is for a set of four (4) service caster series #30 casters, two (2) swivel casters with side lock brakes & bolt swivel locks, and two (2) swivel casters with bolt-on swivel locks, with 3.25" diameter by 2" wide polyurethane on cast iron wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 2,400 lbs. (600 lbs./caster).