Chair Wheels for Revolving Chairs Thread Grip Ring Stem is Heavy build to cater to household as well as office applications. Precision ball bearings in the caster swivel and axle provide smooth, easy rolling while causing no squeaky sounds or noise of any kind. The rubber wheels offers more flexibility to move around your office, no matter the surface, but the polyurethane will protect your hardwood floors from any scratching or extra pressure, allowing you to move freely while taking care of your floors. The Roller Office Chair Wheels are encased with soft, polyurethane material our Rollerblade style wheels are guaranteed not to scratch or leave marks on any surface. Entire support bracket and internal parts are made of superior grade steel, providing years effortless rolling and durability. The heavy duty design supports up to 150 Kg, the STRONGEST chair wheels. Remain focused and relaxed with the help of these caster wheels. Precision ball bearings in the caster swivel and axle provide smooth, easy rolling while causing no squeaky sounds or noise of any kind. These casters are designed with the universal standard size stem, so you can transform any task chairs or stools that roll into modern, striking furniture.