Heavy duty garage door anti-theft device that will avoid the door from sinking in and pulling away. Heavy duty welded steel frame and tube with a polyester powder-coated finish. Protection is made with an external heavy duty lock anchor fixed in the ground preventing tearing away. 2 lateral abutments are fixed from the inside and block the door to prevent tilt action. Screws are hidden in the lock anchor and are inaccessible. Adapted to suit any type of garage door. Supplied with all fixings, diskus padlock and 2 keys.