G.R.I.'s Alarmed Window Bars will fit windows from 30" to 42" wide with no cutting required. If window is higher than 14", two or more Window Bars may be used. The GRI Window Bars protect both sides of a sliding window even when open without triggering an alarm and can be connected to a 24 hour zone. When the bar is dislodged an alarm is activated. The G.R.I. Alarmed Window Bars are easy to remove during an emergency and will work with both hard wired or wireless systems. The bars are designed to fit the window one way and are difficult to be installed incorrectly. The reinforced extruded aluminum will not sag or flex in high temperatures. For windows smaller than 30", the 5/8" bar may be cut off to fit. Make certain that you cut off the end without the magnet.