4 Piece Polyurethane on Aluminum Caster Set

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 aluminum wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 2800 lbs. (700 lbs./caster).