Simply tighten the topmost knurled nut to compress the rubber for a snug fit.). The non-marking, non-marring polyurethane wheels perform especially well on hard surfaces such as concrete, tile, and wood. 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.
5" x 2" Poly Tread on Cast Iron Keyed Drive Wheel - 20mm Bore - Polyurethane on cast iron is the most versatile and cost-effective industrial wheel on the market. Service Caster is unsurpassed in quality, reliability, and excellent customer service. Featuring a green polyurethane tread and a silver cast iron core, this keyed drive wheel comes with a 20mm plain bore and a 6mm x 2.