Features Good Compatibility: This air conditioner support bracket's tie bar can easily expand from 34.6 inches to 41.7 inches, fits most single or double hung window with sills, and is suitable for 5,000 to 24,000 BTU air conditioning units. Safe And Reliables: This window AC mount is made of excellent heavy duty steel material that can hold up to 220 lbs.The steel frame is coated with resin to resist rusts and provide stable support in all kinds of harsh weather conditions. Adjustable: The legs, tie rods, balance pads and rubber feet of this air conditioner stand can be adjusted in length or position to provide stable support for a variety of window air conditioners with different window sills. 2 Mounting Methods: This air conditioner bracket features two mounting methods, whether mounted on a window sill or a window frame, the dual AC bracket reduces air conditioner damage to window, walls, and frames by spreading the stress on the window frame. Easy Installation: This window air conditioner bracket installs without drilling holes or damaging walls, and the bracket typically fits brick, concrete, and wood window sills rather than hollow aluminum sills. Spec: Item Type: Air Conditioner Stand Material: Heavy Duty Steel, Rubber Installation: Wall Mount, No Drilling Required Maximum Load Capacity: 220lb Compatible Window: 5000 to 24000 BTU Package List: 1 x Air Conditioner Stand Package List 1 x Air Conditioner Stand