Sash lifts are mechanical devices used to raise and lower window sashes, which are the frames that hold the glass panes in a window. They are commonly found in double-hung windows, allowing for easy operation and ventilation. Sash lifts can be made from various materials, including metal and plastic, and are designed to provide a secure grip for users. These lifts work by counterbalancing the weight of the sash, making it easier to open and close the window. Proper installation and maintenance of sash lifts are essential for ensuring smooth operation and longevity, contributing to the overall functionality of the window system.