John Sterling Non-Opening Style 3-Bar Child Safety and Window Guard, Black, 1123-DB Non-Opening (Fixed) Style Child Safety & Window Guard New York City approved for non-sleeping areas (HDWG 05-87-86 & HDWG-04-93-09) This 3-Bar unit if for maximum window opening heights of 18-inches This unit is adjustable in width for window widths of 24-inches to 42-inches Solid steel bars are spaced 4-3/4-inches apart to add security to any window Tested to withstand 150 lbs. force at maximum extended width Mounts Inside or Outside (Required in NYC)