4 Piece Poly on Aluminum Swivel Caster Set

Listing is for a set of four (4) Service Caster Series #30 stainless steel swivel casters, two (2) with side locking brakes, with 6" diameter by 2" wide polyurethane on aluminum wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 4,700 lbs. (1,200 lbs./caster).