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The frame, stem and wheel axle all made of high-grade steel. The casters are made of durable hard plastic with a shell of top-quality transparent polyurethane. 7/16" (11mm) x 7/8" (22mm)- fits office chairs sold in the USA with 11mm stems. Step 1:Pull off the old 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.







