Features:OOTDTY Smooth and Quiet Ride The 2.5 inch work tremendous on hardwood, tile and even carpet. All elements are made from wonderful and provide the smoothest maneuverability.All The Top Brands 7/16" (11mm) x 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 workplace chairs.Easy Installation Our will fit most standard office chairs that are made in North America (US and Canada). Please measure your previous caster first. To Installation Just for pop off your previous (you may grip them with a glove or towel) and push on your newRound Gives your old chairs Gives your new chairs upgraded performance operation. PU will NEVER scratch floorsUpgrade your office wheel chairs with our 2.5" on your office chair.Specifications:Material: PUStem Size: 11x22mm/0.43x0.87"Wheel Diameter: 63mm/2.48"(Approx.)Wheel Thickness: 2.4cm/0.94"Quantity: 1 PcNote:Please allow 1-3mm error because of manual measurement. pls ensure you do not intellect earlier than you bidDue to the variation between diversified monitors, the image may not replicate the particular coloration of the item. Thank you!No Retail PackagePackage Includes:1 x Rolling Caster