XINXU High-Quality And Durable MaterialThe Supporting Surface of the Ball Bearing Seat for Furniture is Made of Galvanized Iron and Nylon, Which is Scratch-Resistant, Anti-Corrosion, Anti-Rust, Stable, Not easy to Damage, And Durable.Package And SizeWe pack a Total of 6 Pcs Ball Casters with 16mm Diameter Ball Bearing Rollers. We will pack them in Plastic Boxes for easy Storage.Easy InstallationThe Transmission Bearing has two Screw Holes, The Diameter of the Installation Hole is 4 mm, Just use Screws to Fix the Nylon Ball Conveyor on the Carried Items.Ball BearingThe Maximum Bearing Capacity of a Single Caster is 15 kg, Which is Suitable for most Items and can be Rotated 360 Degrees in a Universal Direction.Used In Various OccasionsFurniture Casters, Ball Casters are Mainly Used to Carry Objects, Not only for Sofas, Showcases, Trolleys, Shelves, Scooters, Cabinets and Kitchen Appliances, etc. But also for Transmission Systems, Power Systems, Processing Systems, Packaging Machine and Auxiliary Machine.Product descriptionSpecifications :Load-Bearing : Single-Wheel Load-Bearing 10-15 kgMaterial :Casters : Galvanized IronScrew : Stainless SteelSize :Roller : 16 mmRoller Roller : 48 x 32 mmScrew Hole : Diameter 4 mmPackage Includes :6 Casters with Ball