Polyurethane Caster Set with Ball Bearings 2 Swivel Lock 2 Brake

The 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) swivel casters with side lock brakes, with 6" diameter by 2" wide polyurethane tread set on a polyolefin core wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 3,600 lbs. (900 lbs./caster).