Prime-Line S 4763 Fixed Window Guard &ndash; 4-Bar Window Guard Prevents Accidental Falls and Adds Child Safety Measures to Windows (23-1/2 in. - 40 in. x 21-3/8 in, Black Steel, Non-Egress) INCLUDES  (1) Fully adjustable (prior to fastening) 23-1/2  40 x 21-3/8 black steel fixed window guard; complete with one-way installation screws. Fabricated of .048 thick, plain carbon steel square tubing with3-7/8 bar spacing. PREVENT ACCIDENTAL FALLS  This steel fixed window guard can be used to prevent children and others from accidental falls through open windows. It does not meet egress, and should not be used in bedrooms or sleeping areas where no other emergency exit window is accessible. ADDITIONAL CHILD SAFETY MEASURES  This 4-bar fixed window guard prevent falls from high-rise buildings, apartments or two-story homes. It provides additional child safety measures so you can rest easy. ADJUSTABLE WIDTH  Use this window guard on a variety of window sizes  the width adjusts for 23-1/2 to 40 wide windows and has a fixed height of 21-3/8. NON-EGRESS  This is a non-egress fixed window guard, meaning that once its been installed it cannot be easily removed in the event of emergency. For windows requiring emergency access capabilities, please use appropriate hinged version of these window guards, like Prime-Lines model number S 4779.