4 Piece Poly Ball Bearing Caster Set with 2 Brakes

The listing is for a set of four (4) service caster series #20 swivel casters, two (2) with top locking brakes, with 6" 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).