The zinc plated finish provides durability under any condition.
This ensures the wheel will not flat spot, as can occur with comparable polyurethane wheels, resulting in a smooth and solid roll over long periods of time. Listing is for a set of four (4) Service Caster Series #20 swivel casters, four (4) swivel 3/8" threaded stem casters with top lock brakes, 4” diameter by 1-1/4” wide solid polyurethane wheels.Count on us to move you forward. The Service Caster Series #20 is ideal for light and medium duty material handling, carts, equipment, and shop projects.