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CASTERS YOU CAN KEEP FOR LIFE - Our Premium replacement caster wheel stem diameter is 7/16 inch(11mm),stem size is 7/8 inch(22mm),The heavy duty design helps up to 500 lbs as a set of 5 SMOOTH & QUIET ROLLING - Wheel materials are fabricated from fine polyurethanes, which are high mechanical strength, wear resistance, surprise absorption and low-noise. These elements help roll easily and cause no squeaky sounds or noise of any kind. SAFE FOR FLOORS - Smoothly and quietly roll round on any hardwood, ceramic tile, wood, carpet, especially cement floors without scratching, please listen in on safety due to much less resistance drive EASY TO INSTALL - Simply pull your previous casters out, then plug the new wheels in, universally match for different normal seats: work stools, workplace chairs, dining chairs, table wheels, instrument carts and so on colour:Black Material:PU size:50mm Package Contents: 5 x Caster Wheels Only the above equipment content, other merchandise should not included. Note: Light taking pictures and different reveals may cause the colour of the article in the photo a bit diverse from the genuine thing. The size allowed error is +/- 1-3cm.