Structure in galvanised steel with transparent rubber wheels. Screwing of the castors to the furniture panels(including screws for assembly). High-quality universal wheels,luggage table and chair accessories are complete in size! 4 castors with a diameter of 50 mm:2 with brake and 2 without brake. Offering a premium combination of low friction and quiet operation, they protect floors and reduce noise, making them ideal for concrete, marble, and hardwood floors. These casters are highly versatile and provide the support needed for a wide range of applications.