8t8 replacement chair caster wheels 2'', heavy duty wheels with plug-in stem 7/16''x7/8'',quiet & smooth rolling, no chair mat needed, safe for hardwood carpet tile floors,set of 5 (black, 2 inch) 8t8 wheel materials are made of high-quality solid polyurethanes, which are high mechanical strength, wear resistance, shock absorption and low-noise.<br> caster stem is supported by steel sets of double ball bearings, making the wheel more solid and endurable. <br> double hard steel brackets support heavy duty, holding over 100 lb per wheel, supports up to 500 lbs as a set of 5, the strongest chair wheels on amazon.<br> work on any hardwood, ceramic, wood, carpet, cement floors without scratching.<br><br> stem diameter:7/16"(11mm)<br> stem length:7/8”(22mm)<br> wheel diameter: 2inch(50mm)<br> wheel width: 24mm <br> installation: push-in type<br> brake: no <br><br> <b> package includes:</b> 5 pack of replacement chair casters<br> we are committed to providing friendly customer service, please be assured to purchase.