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Finely crafted with a bright zinc plated finish, heat-treated ball bearing raceway, and a phenolic wheel, this versatile caster is ideal for work tables, shop projects, or any equipment with round or square tube legs.Service Caster is unsurpassed in quality, reliability, and excellent customer service. When searching for a reliable and durable solution to your caster needs, look no further than the Service Caster Series 20 expanding stem phenolic wheel casters. Simply tighten the topmost knurled nut to compress the rubber for a snug fit.