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Listing is for four (4) Service Caster Series #20 swivel casters with a 3â diameter by 1-1/4â wide gray thermoplastic rubber wheels and a 7/8" square stems with total lock brakes. The zinc plated finish provides durability under any condition, and the soft, quiet and non-marking thermoplastic rubber wheels perform especially well on hard surfaces such as concrete, tile, and wood. 3 Inch Thermoplastic Rubber 7/8 Inch Square Stem Caster Set Total Lock Brake SCC The Service Caster Series 20 is ideal for light and medium duty material handling, carts, equipment, and shop projects.Service Caster is unsurpassed in quality, reliability, and excellent customer service.