A/C Safe AC-160 Universal Heavy Duty Window Air Conditioner Support Transfers the weight of the air Conditioner from the window sash and sill to the support and window Frame for safety Minimizes the chance of damage to the window, window parts or outside wall Compatible with 4 - 11 inches thick walls. Supports up to 160 lb Makes Window AC installation Easier - Just slide unit on bracket for increased stability The Original Window Air Conditioner Support