1.Material: The threaded stem swivel casters made of polyester and steel, non-marking polyurethane type. The double base ball, quiet and noiseless, suitable for all types of floors, will not interfere with others when moving. 2.Dimension: Total height: 13.3cm / 5.2inch, Wheel diameter : 7.5cm / 3 inch, Wheel thickness: 2.1 cm / 0.83 inch, M12 Thread size: 1.2 * 3cm / 0.47 * 1.2 inch (D * H). 3. Brake design: The brake locks the wheel and the pivot bearing at the same time, which is essential for safety. The body of the steel structures is extremely strong and resistant to dirt. 4. 360 Rotation: The 360 rotatable threaded rod allows the connecting equipment to be rotated, ideal for transporting light furniture and screens quietly and safely 5. Application: Perfect casters for equipment and furniture, including coffee table, seat, bookshelf, plant stands, book shelves, shoe bins, toy bins, shopping baskets, workbenches, trolleys, carts and other heavy objects