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For added security, further compress the rubber with a wrench via the nut under the swivel raceway. When searching for a reliable and durable solution to your caster needs, look no further than the Service Caster Series 20 expanding stem hard rubber wheel casters. Finely crafted with a bright zinc plated finish, heat-treated ball bearing raceway, and a hard rubber wheel, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs.