Listing is for a set of four (4) Service Caster Series #20 stainless steel casters, two (2) swivel 1/2"-13 X 1-1/2" threaded stem with total lock brake casters and two (2) swivel casters, with 5” diameter by 1-1/4” wide hard rubber wheels. Supports a total weight of 1,200lbs (300lbs/per caster).