ACOMPATIBLE Replacement Office Chair Caster Wheel for Hardwood Floor - Stem Diameter 11mm, Stem Length 22mm - Set of 5 (Black) Those Caster Wheels are made to Protect Hardwood, Laminate, Tile, Slate, and all other Hard Floors Industrial Standard Fits Most Office Chair Models Available - Stem Diameter: 11mm; Stem Length: 22mm Maximum Weight Rating: 100lb/wheel Works Perfect On Carpets and any Hard Floors. Made with Polyurethane Material Easy pull and snap installation - 2 years Warranty