The wheels can be used for aluminum door and window wheels, wardrobe wheels, screen window wheels, and plastic steel window wheels. wheels number: single wheel and double wheel. The wheels materials : PP/PC, ABS, nylon, POM, and copper.There are many colors of wheels. We provide OEM/ODM services. You can also follow Sample customized molds. Every time a customer places an order, we will ask whether the inner diameter of the customer’s wheel and the diameter of the aluminum track slot used are the same, otherwise the sliding window roller wheels and the aluminum material have a low degree of agreement.