Universal Design: Our air conditioner brackets for windows Designed to fit most of the window A/C units on the market,suitable for solid window stills ,brick ,cement, solid wood.It can also adapt to tilting installation surfaces.United States Patent:US 10295221 B2. Strong Quality: The ac window bracket from Heavy duty steel constructed finish with a nice powder coating surface treatment, allows the bracket to survive all weather elements, designed for long term outdoor service. Sturdy Structure:Window ac bracket Simple two pieces structure to provide extra strength, Ac holder for window light weight and sturdy, max loading capacity 165 lbs, Easy Installation: Ac stand soporte para aire acondicionado de ventana,Quick installation from the inside of the house,all hardwares included.No drilling of outside wall or siding, just drilling into window sill. Wall Thickness: Base para aire acondicionado de ventana Fits wall thickness from 2'' to 15.2'',Base para aire acondicionado de ventana exclusive built-in bubble level to correct mounting slope position.