4 Piece Polyolefin Roller Bearing Caster Set with 2 Brakes and 2 Rigids

The listing is for a set of four (4) service caster series #20 casters, two (2) rigid and two (2) swivel casters with top locking brakes, with 4" diameter by 2" wide polyurethane on polyolefin wheel and roller bearings capable of supporting a total weight of 1,800 lbs. (450 lbs./caster).