Multiple Sizes Optional - Heavy duty aluminum alloy rotating bearing with multiple sizes to choose from: 10/15/20/25.4 cm (optional). It is thickened and greatly improves the load-bearing capacity. High Quality Material: Made of heavy duty aluminum alloy, solid and durable, corrosion and rust resistant. You can choose the top material like wood, glass, marble to match your home style. Non-slip rubber feet Equipped with non-slip rubber feet and convenient to use. These bearings can be screwed or fixed as they have through holes and pre-drilled holes. Easy to install, no installation required. Attention: Ball bearings use rolling elements to maintain separation between moving parts to reduce rotational friction and support radial and axial loads, and sealed bearings are lubricated with oil, so you should periodically reapply lubrication, depending on usage. Widely Uses: Can be used for tables, corner cabinets, storage solutions, dinnerware, magazine racks, TV and computer monitor