Securely attach to an exposed-fastened roof while still allowing free flow of rainwater under the system. All you need is the GRIPPERFIX® rail, S-5!® self-piercing fasteners, and EF Tabs. M8 bolts in three different lengths (1.25 x 16, 20, and 40 mm) are also available to use with the damper/leveling pad. Slide the tabs into the strut, and then fasten to the roof ribs. The result: an affordable, secure, rust-free, and long-lasting metal rooftop mount.