This window guard is constructed of 0.048 inch thick, plain carbon steel square tubing and comes in a black painted finish. Note: This is a fixed window guard, meaning that once it has been installed it cannot be opened nor easily removed in the event of an emergency where entry or exit through the window would be required. For this reason, THIS FIXED WINDOW GUARD SHOULD NOT BE USED IN BEDROOMS OR SLEEPING QUARTERS WHERE NO OTHER EMERGENCY EXIT WINDOW IS ACCESSIBLE. For windows requiring emergency access capabilities, please use appropriate hinged version of these window guards, like Prime-Line part S 4779. This child fall window guard is non-operational and it is designed for interior use only. The intended purpose of this guard is to assist in preventing children from accidental falls through open windows. This window guard features a fully adjustable telescoping width (prior to mounting), and it comes complete with one-way, tamper-proof installation screws. This child fall window guard meets New York City and New Jersey’s housing codes, and it was approved by the New York City Department of Health and Mental Hygiene, HDWG #04-09-2010, but it does not meet egress.