4 Piece Poly on Steel Caster Set with Ball Bearings

Listing is for a set of four (4) service caster series #30 casters, two (2) swivel casters with bolt on swivel locks and two (2) rigid casters, 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).