When searching for a reliable and durable heavy duty solution to your caster needs, consider Service Caster’s Series 30 stainless steel nylon wheel casters. 4 Inch Stainless Steel Nylon Caster Set with Roll Bearings 2 Swivel Lock 2 Rigid In contrast to the zinc plated caster, the luxuriously polished stainless steel finish resists rust and corrosion in indoor or outdoor applications where moisture is a factor.