Features:Smooth and Quiet Ride The 2.5 inch work tremendous on hardwood, tile or even carpet. All elements are product of high quality and provide the smoothest maneuverability.All The Top Brands 7/16" (11mm) 7/8" (22mm) common stem–works will with for Herman for Miller Aeron, Hon, Galam, for Serta, Lane, Humanscale the gaming chair and for Steelcase, Knoll ergonomic office chairs.Easy Installation Our will match most standard workplace chairs that are made in North America (US and Canada). Please measure your old caster first. To Installation Just for pop off your old (you may perhaps grip them with a glove or towel) and push on your newRound Gives your previous chairs Gives your new chairs upgraded performance operation. PU will NEVER scratch floorsUpgrade your office wheel chairs with our 2.5" on your workplace chair.Specifications:Material: PUStem Size: 11x22mm/0.43x0.87"Wheel Diameter: 63mm/2.48"(Approx.)Wheel Thickness: 2.4cm/0.94"Quantity: 1PcNote:No retail package.1cm=10mm=0.39inch.Please enable 1-2cm error thanks to manual measurement. pls make sure you don't mind before you bid.Due to the variation between various monitors, the picture may not replicate the particular coloration of the item. Thank you!Package Includes:1x Rolling Caster