A casement stay is a metal bar used to hold a casement window in a specific open or closed position. Metal windows will normally have the stay included at the time of manufacture, while wooden windows will have them added after fitting. Different kinds of casement stay include peg type, telescopic and friction The range of opening depends on the length of the bar and the position of the pins. There are locks that can put a bolt through a hole in the stay to prevent the window from opening. Four bar stays combine their function with a hinge, and can shift the window sideways as it opens.