4 Piece Poly on Polyolefin Caster Set with Ball Bearings and Rigid

Listing is for a set of four (4) Service Caster series casters, two (2) swivel and two (2) rigid casters, with 4" diameter by 2" wide polyurethane on polyolefin wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 1,800 lbs. (450 lbs./caster).