1. Material: The screw casters are made of PVC, a non-marking polyurethane type. Double base ball, quiet and silent, suitable for all types of terrain and will not disturb others when traveling. 2. Dimensions: Overall Height: 10.5cm, Wheel Diameter: 7.5cm, Wheel Thickness: 2.1cm, M10 Thread Size: 1 x 3cm / 0.4 x 1.18 inch 8 D * H. 3. Brake design: The brake locks the wheel and the pivot bearing at the same time, which is essential for safety. The main body of the steel structure is very strong and resistant to dirt. 4. 360 Swivel: The 360 swivel threaded rod allows swivel attachment of devices, ideal for silent and safe transport of light furniture and screens. 5. APPLICATIONS: Perfect casters for equipment and furniture, including coffee tables, seats, bookshelves, plant shelves, bookshelves, shoe boxes, toy chests, cart storage, workbenches, wheelbarrows, carts and other heavy objects.