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Features: High quality office chair rubber caster wheel. Heavy Duty & Safe fit all office chair bases with mounting holes. Twin wheel design enhances weight distribution and smooth operation, ease to glide and swivel. Swivel and roll freely and more quietly in every direction with no need for maintenance. Soft roll rubber wheel surface guaranteed to leave no mark on carpets or any kind of natural and engineered wood floor, tile floor, specialty floor, and smooth concrete/asphalt floor. Easy fit - Just click in. Specifications: Material: Steel and Rubber Wheel diameter: 50mm (2-7/8") - Approx 3" Stem Length: About 22mm (7/8 inch) Stem Diameter: Approx 10mm and 11mm (Look at the picture) Color: Black With Transparent Package Includes: 5 x Chair Wheels