Welcome to our store We have many different items to choose from by entering the store, thank you! Specification: Item Type: Wheelchair Wheel Material: PU Material Diameter: Approx. 197mm 7.8in Tire Thickness: Approx. 23mm 0.9in Wheel Hub Thickness: 40mm 1.6in Bearing Model: 608zz Bearing Hole Diameter: Approx. 8mm 0.3in Bearing Outer Diameter: Approx. 22mm 0.9in Bearing Thickness: Approx. 7mm 0.30in (There may be small error in manual measurement.) Package List: 1 x Wheelchair Wheel Note: Please match the appropriate size before use. Note: 1. Please allow a small amount of error due to manual measurement, thanks for your understanding. 2. Monitors are not calibrated the same, item color displayed in photos may be showing slightly different from the real object. Please take the real as standard. 3. If you have any questions, you can send us an email, you are welcomeSatisfaction Guarantee: Committed to making every customer have a satisfactory purchase process, if you encounter unsatisfactory or damaged packages, please contact us, we will give you a satisfactory processing result, and maintain effective communication!. Applicable Scope: Suits perfectly for wheelchair, walker, rollator and so on, very easy to install as well, can meet your use and replacement needs, very practically. Ball Bearing: Equipped with accurate metal ball bearing, moving not stuck, the tire enables smooth rolling and great durability, this caster is guaranteed safe to use on a variety of surfaces. 8in Diameter: The wheelchair wheel with 8in large diameter ensures quick moving with great stability, thickened wheel hub is not easy to deform, which also has great load bearing capacity. Polyurethane Caster Wheels: Made of high-quality polyurethane material, with thermoplastic linear structure, better stability, resilience and mechanical properties, low temperature resistance, wear resistance and aging resistance, high hardness and elasticity, not easy to damage.