[UNIVERSAL FITS 99% CHAIRS] The swivel chair castors are suitable compatible with most office chairs as well as chairs compatible with computer games, desk chairs, gaming chairs, executive chairs, swivel chairs, desk chairs or office chairs. With the standard shaft size (shaft diameter: 7/17 inch, shaft length: 7/8 inch).[SILENT] The hard floor castors are made of high quality steel and are absolutely robust. 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, nobody will be bothered by it, because nobody hears you.[SAFE compatible with ALL SURFACES] Hard floor castors protect your floor in the long term with the soft and heavy-duty polyurethane edge. Scratches, cracks or other damage will never appear in your floor. Our gentle swivel chair castors also guarantee that no dark or black marks will be scratched or left on any surface. These office chair casters are perfect compatible with expensive hardwood tile, parquet, granite, stone, concrete or vinyl flooring without causing scratches.[EASY TO INSTALL] With rust-proof and flexible bearing, office chair castors are easy to install and dismantle. These swivel chair castors are also hard to get blocked by crumbs, grit or hair, with removable screws these hard floor castors are easy to clean, so the castor set is your best choice as a replacement compatible with old wheels.[HIGH QUALITY AND DURABLE] The precision bearing ball of office chair rollers are made of high quality steel with good hardness and avoid any decompatible withmation. The office chair castors have a long service life. With high quality and resilience, office chair castors can be an excellent office companion compatible with you.Colour: blackMaterial: PUSize: 11x22mmPackage Contents:1 * CastersOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.