The Generic Air Conditioner Top Rail Safety Bar is a white, model-specific safety bar designed for mounting an air conditioner with a cooling capacity of 8000-8999 BTU. It is specifically made for window mounting and has a width of 18.5 inches. This top rail provides stability and prevents the air conditioner from falling out of the window while in operation, ensuring safety and security during use. Also have 4th one that measures just under 16”. Best offer’s considered!