Universal Office Chair Casters Set, 3 Rollerblade and 2 w/BrakeFits chair with Φ11mm stemsRemain focused and relaxed with the help of these premium replacement casters, which are with standard stem size –7/16 inches x 7/ inches. The wheel diameter is 3 inches. It fits for most rolling chairs, computer chairs, office chairs and game chairs on the market. But NOT compatible with IKEA chairs. Precision ball bearings in the caster swivel and axel provide smooth, easy rolling while causing no squeaky sounds or noise of any kind. Encased with soft, polyurethane material these rollerblade style casters are guaranteed not to scratch or leave marks on any surface like hardwood, laminate, tile and carpet floors. Set of 5 includes 3 rollerblade style and 2 w/brake style. This also means more stable experience with the help of the stops. Plus all are in industrial-grade standard that support loads up 330 pounds.