Replacement Swivel Office Chair Wheels Casters Universal Fit Features:1. Protect Your Floors: Each rolling chair wheel is encased in TPR soft rubber guaranteed not to scratch any surface. Quietly gliding over carpet, tile or hardwood without scratching, protectyour floor.2. Heavy Duty & Durable: Maximum weight rating: 130 lbs. EACH wheel. All internal parts made of superior grade steel make the caster wheel more durable, sturdy to use.3.Smooth and Silent Rolling: With four high quality ball bearings on each wheel, it can keep your chairs moving smoothly and quietly. No more squeaking and rattling.4.Universal Fit & Easy Installation: 2 step assembly process, just take your old casters out and push your new ones in, and you are doneSpecifications:Material: Steel and TPR RubberWheel diameter: 50mm(Approx 2 inch)Stem Length: About 22mm (7/8 inch)Stem Diameter: Approx 10-11mm (7/16 inch) (Look at the picture)Color: BlackPackage Included:1/3/6/9 Chair universal wheel