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Listing is for one (1) Service Caster Series #20 1" expanding stem swivel caster with a 4" diameter by 1-1/4" wide black hard rubber wheel and a top locking brake capable of supporting 300 lbs./caster.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. The Series #20 features an innovative expanding stem that can easily adapt to the inside diameter of the opening, allowing for a secure fit in round or square tubes. Simply tighten the topmost knurled nut to compress the rubber for a snug fit. For added security, further compress the rubber with a wrench via the nut under the swivel raceway. 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. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Count on us to move you forward.