1. The aluminum alloy window sash has three holes at the bottom of the vertical material.
2. The middle hole is called the pulley hole and is used to adjust the height of the window sash.
3. Tightening the screw in the pulley hole will raise the window sash.
4. Loosening the screw in the pulley hole will lower the window sash.
5. You can adjust the pulley hole as needed to adjust the height of the window sash.
