Product Description TRULY SMOOTH, QUIET, SAFE CHAIR WHEELS IN YOUR OFFICE OR HOME! THE MUST-HAVE OFFICE REPLACMENT These delicate rolling wheels manufactured from high-quality polyurethane, they won't smudge, scratch, or damage your floors. Our wheels are safe to apply on hardwood, tile, carpet, laminate, pergo, tile and more. UNIVERSAL FIT 7/16" (11mm) x 7/8" (22mm)- suits office chairs sold within the USA with 11mm stems, resembling Steelcase, Freedom, Dxracer, Hon, Herman Miller Aeron, Lazyboy Serta, Humanscale Freedom and more. DON'T FIT IKEA CHAIR. SUITABLE FOR ALL FLOORS Never fear to break your costly hardwood floors even without office chair mat. They are safe for all floors,like hardwood,laminate,vinyl,tile or short-pile carpet etc. 360-DEGREE SMOOTH & QUIET ROLLING The maneuverability is excellent and the bearings inside the chair casters allow it to swivel easily. You can roll round the office or home smoothly due to the precision ball bearings of the caster swivel and axle. EASY ASSEMBLY- Your workplace chairs will look more nice looking through the use of those office chair caster wheels. Our caster wheels didn't require tools for replacement, easily pull out the previous wheels from the chair base, push the stem of your new chair wheels into the socket and end in 10 MINUTES.