Universal FitOur office chair wheels have a stem size of 7/16 (11mm) diameter by 7/8 (22mm) length,making them compatible with most office chair models available.Before purchasing our office chair wheels,please take measurements to ensure a proper fit. Easy InstallationOur office chair wheels can be replaced without any tools.Its as simple as pulling off the old wheels and pushing on the new ones.Each wheel can be installed in less than 5 seconds,so you can quickly bring your chair back to life. Quiet and Smooth GlidingWith double castors,our office chair wheels reduce the load and provide improved stability and easier steering compared to single-wheel designs.The high-quality ball bearings on each wheel ensure quiet and smooth gliding,and prevent getting stuck by fur or hair. Safe ProtectionOur office chair wheels are made of high-quality polyurethane and have a high load capacity of up to 1000lbs,making them safe for even a big person sitting on a rolling office chair.They also protect hardwood,laminate,tile,slate,and all other hard floors from scratches and damage. Quality AssuranceOur office chair wheels are perfect for home or office use and are built to last. Packing 5 x Chair Wheels