["Features:\nSmooth and Quiet Ride - The 2.5 inch style wheels work great on hardwood, tile and even carpet. All parts are made from high quality and provide the smoothest maneuverability.\nCompatible With All The Top Major Brands - 7/16\" (11mm) x 7/8\" (22mm) universal stem–works will with for Herman for Miller Aeron, Hon, Galam, for Serta, Lane, Humanscale Freedom, the gaming chair and for Steelcase, Knoll ergonomic office chairs.\nEasy Installation - Our wheels will fit most standard office chairs that are made in North America (US and Canada). Please measure your old caster first. To Installation - Just for pop off your old wheels (you may grip them with a glove or towel) and push on your new style wheels.\nBonus Round - Gives your old chairs new life. Gives your new chairs upgraded performance Whisper quiet operation. PU wheels will NEVER scratch wood floors\nUpgrade your office wheel chairs with our 2.5\" style wheels for your office chair.\n\nSpecifications:\nMaterial: PU\nStem Size: 11x22mm/0.43x0.87\"\nWheel Diameter: 63mm/2.48\"(Approx.)\nWheel Thickness: 2.4cm/0.94\"\nQuantity: 1 Pc\n\nNote:\nPlease allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nNo Retail Package\nPackage Includes:\n1 x Rolling Caster"]