【UNIVERSAL FITS 99% OF CHAIR】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 wheels are made of high quality steel and are absolutely stable. If you move the hard floor casters on the office chair, you will not hear any noise at all. Even if you work or play in your office at night, no one will be disturbed because no one can hear you. 【SAFE FOR ALL SURFACES】The hard floor wheels protect your floor in the long term with the soft and durable polyurethane edge. Scratches, cracks or other damage will never appear on your floor. Our soft casters also ensure that no dark or black spots remain on any surface. These office chair