Listing is for a set of four (4) Service Caster Series #20 stainless steel swivel casters, four (4) swivel 10mm threaded stem casters with total lock brakes, 5? diameter by 1-1/4? wide solid polyurethane wheels. Supports a total weight of 1,200lbs (300lbs/per caster). The Service Caster Series #20 is ideal for light and medium duty material handling, carts, equipment, and shop projects. The zinc plated finish provides durability under any condition. And the non-marking, non-marring polyurethane wheel is molded as one solid piece, making it free from debonding. 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. Mounting options include top plate, bolt hole and standard and metric threaded stem sizes. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.