The Service Caster Series #20 is ideal for light and medium duty material handling, carts, equipment, and shop projects. Finishes are available in either zinc plating, which provides durability under any condition, or stainless steel, which resists rust and corrosion in indoor or outdoor applications where moisture is a factor. Mounting options include top plate, bolt hole and standard and metric threaded stem sizes. All rolling on a finely crafted ball bearing design that keeps you moving forward.