[Quality Material]Furniture wheels are made of high quality PVC and steel, with a thickened wheel core, low noise double bearings and high hardness screws for durability. Thread Diameter: 8mm/M8; Thread Length: 25mm/0.95""; Wheel Diameter: 50mm/1.96"" Set includes 4 casters, perfect for heavy furniture.[Super Load Holder]The thickened base plate of the black castors furniture is not easy to deform and has a higher load capacity, which can bear 70kg individually and 280kg in a group of 4. It is suitable for moving furniture, goods or other heavy objects and is easy to install by turning the holes and tightening the screws, which can be easily mounted on furniture without the need for screws and screwdrivers.[Silence and Wear Resistance]M8 Heavy Furniture Casters are made of high quality PVC Microsoft wheel surface, quiet and wear-resistant, safer to protect floors and carpets from scratches or dents caused by heavy objects. The double locking device can lock the casters and swivel bearings at the same time, which can lock the furniture firmly to ensure stability and safety.[Flexible Rotation, Easier to Move]The furniture casters adopt double ball design, more flexible rotation, 360 degree free rotation, convenient for furniture moving and fast rotation, making furniture more flexible and easier to carry. Whether on smooth or uneven surfaces, these castors work stably and are a good choice for less strong people.[Widespread Use]Furniture wheels for transport are suitable for all kinds of heavy furniture, such as supermarket trolleys, trolleys, office chairs, cabinets, bookcases, work desks, bed backgrounds, stands, mobile furniture, etc. They enhance the mobility and flexibility of furniture and are ideal for furniture, workshops, industry, warehouses, moving houses and everyday activities.