Extra Heavy Duty Poly on Cast Iron Caster

Listing is for a set of four (4) Service Caster Series #20 stainless steel casters, two (2) swivel and two (2) rigid casters, with 3-1/2" diameter by 1-1/4" wide red polyurethane wheels capable of supporting a total weight of 1,200 lbs. (300 lbs./caster).