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Listing is for a set of four 4 Service Caster Series #20 1-1/2'' expanding stem swivel casters, two 2 with posi locking brakes, with 4'' diameter by 1-1/4'' wide nylon wheels capable of supporting a total weight of 1,200 lbs.Service Caster is unsurpassed in quality, reliability, and excellent customer service./caster. When searching for a reliable and durable solution to your caster needs, look no further than the Service Caster Series 20 expanding stem nylon wheel casters.