An advanced upgrade of office chair casters, the heavy duty casters can be used as office chair replacement wheels. Full metal, high hardness bearing stem provides years of easy rolling and durability. The sturdy design (set of 5) can support 250 kg (weight). The extended wheel bar is strong and durable, and the reinforced design is more sturdy. Wide and thick double wheel structure, soft PU material, withstand higher pressure, quiet and smooth, will not damage the floor, will not scratch or leave marks on any surface. Each wheel uses four high quality ball bearings, fashionable, more comfortable, more stable and quieter. Easy installation without tools or hardware. Simply remove the old wheels and slide them into place. Spindle size is 11mm (7/16'') diameter x 22mm (7/8'') long The chair is compatible. Chair wheels make your chairs more fashionable and comfortable, so you can feel comfortable with the usual elegant office chairs or computer chairs. Chair casters will be the best choice to upgrade your chairs.