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7/16" (11mm) x 7/8" (22mm)- fits office chairs sold in the USA with 11mm stems, such as Steelcase, Freedom, Dxracer, Hon, Herman Miller Aeron, Lazyboy Serta, Humanscale Freedom and more. Don't fit Ikea chair The axle is equipped with 4 bearings for each chair wheel that makes movement smoother and allows for a greater weight loading, which stronger than any other chair wheels replacement.Maximum load up to 700LBS CAPACITY. STEP 1:Pull off the old chair casters from the chair base, with no need for any tools STEP 2:Push the stem of your new office chair wheels into the socket, until the stem is firmly anchored.






