UNIVERSAL FITS 99% CHAIRS The swivel chair casters are suitable for most office chairs as well as computer gaming chairs, office chairs, gaming chairs, executive chairs, swivel chairs, desk chairs or office chairs. There are many kinds of brands that are compatible with our office chair casters, such as Herman Miller Steelcase, Aeron, Dxracer, Humanscale Freedom, Lazyboy Serta, Hon, Boss, etc. , stem length: 7/8 ) QUIET The hard floor casters are made of high-quality steel and are absolutely sturdy. When you slide the hard floor casters on your office chair, you will hear absolutely no noise. Even if you work or play in the home office at night, no one will be disturbed because no one can hear you. SAFE FOR ALL SURFACES The hard floor casters protect your floor in the long term with the soft and durable polyurethane edge. Scratches, cracks or other damages will never appear on your floor. Our soft swivel casters also ensure that no dark or black marks will be scratched or left on any surface. These office chair casters are perfect for expensive hardwood tiles, parquet, granite, stone, concrete or vinyl floors without causing scratches. EASY TO INSTALL With anti-rust and flexible bearing, the office chair casters are easy to install and disassemble. These swivel chair casters are also difficult to be blocked by crumbs, sand or hair, with removable screws, these hard floor casters are easy to clean, so the casters set is your best choice to replace old wheels. HIGH QUALITY AND DURABLE Precision bearing ball office chair casters are made of high quality steel with good hardness and prevent deformation. Office chair casters have a long service life. With high quality and resilience, office chair casters can be a great office companion for you. If you sit in your office chair for eight hours a day, our chair wheels will be with you for 15 years. Suitable for 99% of office chairs (not include ikea chair) Universal size: 7/17 or 11 mm Smoothly rotating upper swivel bearing Lower swivel bearing Removable screw Precision ball bearings Electro-coated steel frame Solid steel rivet rod Soft polyurethane material 2-step installation These wheels are easy to install. Remove the old set of rollers and insert a new set of rollers without using tools. Now your chair can come back to life and function in just two steps.