Features: High-quality office chair rubber caster wheels Heavy-duty and safe fit for all office chair bases with mounting holes Twin-wheel design enhances weight distribution and smooth operation, easy to glide and swivel Swivel and roll freely and quietly in every direction with no maintenance required Soft-roll rubber wheel surface designed to leave no marks on carpets, natural wood, engineered wood, tile, specialty flooring, and smooth concrete or asphalt surfaces Easy to install – simply click into place Specifications: Material: Steel and Rubber Wheel diameter: 73mm (2-7/8") – approximately 3 inches Stem length: Approximately 22mm (7/8 inch) Stem diameter: 10mm and 11mm (refer to image) Color: Black with transparent elements Package includes: 1 x Chair wheel set Our products are made from high-quality materials and designed to provide an excellent user experience.