18 inches to fit most 5 Panel Garage Doors Each package includes 1 set of Cobra Racks with clamping hardware on standard garage door panels. Insulated panels require self tapping screws (not included). Made in the USA with durable, high strength ABS material All Hardware Included for Easy Installation No tools required for Standard Installation. Insulated Doors will need to be hard mounted with self tapping screws (not included, but can be shipped at no cost) Can be installed on walls or ceilings