Name: reversible rail roller Material: rubber Size: 2 inches Features: with brake, 360 rotation, smooth and durable, highly resilient The upgraded heavy duty casters are made of high quality rubber with high strength, good wear resistance, quiet and will not damage the floor. 360 flexible free rotation, no blind spot, fast steering, beautiful, safe and durable. Cold rolled steel material: heavy duty, quiet and non-slip, reliable and durable. Package contents: 4 rolls Reminder: If you have any questions, please feel free to contact us contact us.USE FOR MULTIPLE USES: These castor wheels are perfect for so many different uses. Use them for industrial shelving, storage units, toolboxes and work saw benches. You can use them around the home for furniture such as kitchen islands, desks, ottomans, toy shoe bins, outdoor planters, shelves, coffee tables, chairs, and cabinets. Additionally, use them for display exhibition equipment, flight instrument cases, dollies, speakers, and many different types of machinery equipment. Universal use: The wheels can be used to create versatile carts, workbenches, furniture, shelves and other items commonly found in workshops, garages, kitchens, offices, etc. Brakeable casters: Each caster is equipped with a brake at the top, can be locked when not in use, ensuring high safety. 360 rotating wheels: 360 flexible free rotation, no dead ends, fast turning, beautiful and safe and more durable. High-quality materials: The casters are made of rubber, and the upper plywood of the casters is made of cold-rolled steel, with strong bearing capacity, noiselessness and slip resistance.