These aluminum window rollers are designs for smooth sliding and on door and window. Upgrades your door or window systems with these aluminum sliding wheel rollers,ensuring easy operate. Produced of steel/nylon,these window pulleys provide Stable and stability for easy opening and closing. Enhances the functionality of your sliding door and window with these aluminum Glides rollers,build for long-lasting use. improved efficiency and convenience with these aluminum push-pull window rollers,Suitable for various door and window applications.