Sash lifts are fitted to the bottom rail of sliding sash windows so the bottom sash can be lifted open.
Loop and Ring Lifts are sold in pairs and are usually just large enough to be lifted by one finger.
Sash Handles are wider than loop and ring lifts and can be used individually or in pairs depending on window size. They are held with 3 or 4 fingers like a pull door handle.
Sash Bars are traditional type long handles used singly and lifted with both hands, often in public rooms.