The Frost King by Thermal Products light duty steel universal air conditioner support, installs completely from inside. The mount supports up to 80lb or 5,000 to 10,000 BTU'S unit. This is safe & easy to install! Secures easily and is long lasting, includes: precision bubble level, assures proper mounting angle. This unit relieves stress on window, rugged, all weather construction. 2 year limited warranty.