Universal Fit for Most Chairs Standard 7/16" x 7/8" (11x22mm) stem fits 98% of office chairs. Not for 1KEA. Please check size before ordering. Heavy Duty and Durable Made of strong polyurethane and metal, each caster wheel supports up to 200 kg. Perfect for daily office or home use. Quiet & Smooth Rolling Enjoy quiet, smooth swivel movement on hardwood floors, carpet, tile, or laminate. No noise or floor scratches. Protects Floors, No Chair Mat Needed Soft, scratch-free rubber protects hardwood and hard surfaces. Safe for all floors and reduces the need for chair mats. Easy Installation, No Tools Required Replace old caster wheels in minutes. Just pull out the old wheels and push in the new ones—no tools needed. Mastery Mart Office Chair Caster Wheels for Hardwood Floors 2.5 inch Dark Grey