Universal Base SizeGas cylinder 2 inches (5 cm). This 28'' office chair replacement base is suitable for most of the market including Herman Miller (office chair, study chair, desk chair, vanity chair). Please confirm the size before making a purchase. Effortless Glide & Floor-friendlyUpgrade your gliding experience with whisper-quiet wheels that effortlessly glide on any surface, from tiles to hardwood. No more worries about damage or noise. Enjoy smooth and silent mobility at home or in the office. High-quality Craft MaterialsSytopia upgraded office chair base replacement features high-quality chrome construction for enhanced durability. It offers an impressive carrying capacity of 2600 lbs and has ANSI and BIFMA certification. Save on BudgetSave money by opting for a chair base replacement with wheels, costing just 1/5 of buying a new chair, as long as your seat is still in good condition. Preserve your favorite chair and stay within your budget. Ris