High Quality: Precision ball bearings in caster rotation and shafts provide smooth and easy rolling. The inner bearings of the foot wheel roll fast, and the surface is smooth, not stuck by debris, hair and gravel. No Noise and Scratches: The replacement casters roll smoothly and quietly without making any noise and without scratching or leaving marks on any surface. Safety: Rotating double lock casters kit can absolutely lock the wheel and rotating bearings at the same time without slipping. The steel bracket is easily positioned to any desired area and you can unlock and use the wheel easily by pulling up the brake. Multi-purpose: Widely used in shopping carts, trolleys, movable furniture, including dressers, crates, chairs, under bed storage, shoe boxes, toy boxes, cabinets, brackets, display equipment, etc. Service: If you have any questions, please feel free to contact us.