FEATURESHigh high quality workplace chair rubber caster wheelUniversally match all office chair bases with mounting holesTwin wheel design enhances weight distribution and soft operation, ease to glide and swivelSwivel and roll freely and more quietly in every course without having for maintenanceSoft roll rubber wheel floor guaranteed to leave no mark on carpets or any type of pure and engineered wooden floor, tile floor, forte floor, and gentle concrete/asphalt floorMaterial: PU Rubber and Steel and PlasticWheel diameter: About 50mm (2 inch)Stem Length: About 21mmStem Diameter: About 11mm Grip Ring Type (Look on the picture)Size:As the pictures showPackage Included:1/5PcsNote:Due to guide measurement, please enable an error of 1-2cm.As various computer systems show diversified colors, thank you on your understanding, the particular product colour may be slightly diverse from the image.