DGQ Office Chair Caster Wheels 2.5" - Set of 1 with Brake Heavy Duty & Safe for All Floors Including Hardwood - Rollerblade Style Universal Fit Universal Stem Size; Our caster stem will fit 99% of all standard office chairs sold in the USA; (7/16" wide x 7/8" tall) or (11mm x 22mm); Smooth and Quiet Rolling; Our precision ball bearings combined with vibration reducing polyurethane tires will give you a smooth and silent roll. They roll amazingly on hardwood floors, carpet, tile, concrete, stone or vinyl. Heavy Duty Lifetime Warranty; Our high quality steel casters support more combined weight than traditional casters for long lasting endurance & durability. Our rollerblade caster wheels support bracket and internal parts are made of high grade steel and are extremely strong. Safe For All Floors; Protect your floors with our soft & strong high grade polyurethane wheels. If you're worried about your office chair scratching up your hardwood floors, fear no more! Very Easy to Install; No tools required; Pull out your old office chair casters and push in your new wheels until stem is firmly seated and secure;