A door and window mortise handle is a type of handle used to secure a door or window to its frame. It is typically installed into a pre-drilled hole in the door or window frame and is used in conjunction with a latch or lock to keep the door or window closed. The handle is usually made of metal, such as brass or stainless steel, and is often ornately decorated. The handle is inserted into the mortise hole and is secured with screws. It is typically used in residential and commercial applications, as well as in some industrial applications.