Quantity and specification: Including 4 caster wheels, you can choose according to your needs.Size: 2 inch (40mm*50mm*78mm). High quality material: Made Made of high quality zinc alloy and PA material, lightweight and durable, moves quietly and smoothly, smooth and does not hurt the floor. Easy to use: Chair replacement wheels are easy to disassemble, complete the installation in one minute. Wheels with brakes won't make much noise in your comfortable life and won't scratch any hardwood floors. 360 Degree Swivel: Special design, can 360 degree swivel with brake function, start and stop at any time, no noise when rolling, no interference while working. Widely Used: Suitable for goods shelf, storage rack , trolley, kinds of furniture, etc., also for hard floors, wooden floors and other types of floors.< /p>