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Features: ●Safe for all floos,no need chair mat. ●Smooth & Quiet Rolling,flexible steering. ●Easy to assemble,easy to rolling. ●Universal compatibility and durable.(Note:NOT compatible with IKEA chairs). ●Industry-leading customer service. Specifications: Type:Swivel 360 degree rotary Color:Black & Transparent Wheel Material:Polyurethane and steel Wheel Diameter: 3 inch/ 75mm Mounting Height: 3.75inch/ 95mm Stem Size:7/16"x7/8" inch/11mm*22mm Capacity LBS: 650 Lbs (Set of 5 together ) Bearing: ball bearings Package include: 5 x Chair wheel casters(Standard Stem:7/16"x7/8")