Function: These pulleys are embedded directly within aluminum sliding door or window frame profiles. The concave groove on the orange wheel tracks along a bottom rail to ensure smooth, low-friction operation.Adjustability: The steel frame includes integrated screw mechanisms that allow installers to adjust the height and alignment of the sliding panels.Durability: The combination of a rigid metal housing and a high-density plastic/polyurethane wheel minimizes operational noise and resists long-term wear and tear.