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Mounting options include top plate, bolt hole, expanding stem and standard and metric threaded stem sizes. Supports a total weight of 1,000lbs (250lbs/per caster). Listing is for a set of four (4) Service Caster Series #20 stainless steel casters, two (2) swivel 3/8"-16 X 1-1/2" threaded stem with brake casters and two (2) swivel casters, with 3â diameter by 1-1/4â wide red polyurethane wheels..