Our 9 mm PVC Double Rail is a rigid track, designed with a durable middle section to screw into the frame of your structure. It is ultraviolet (UV) treated. Standard rail length is 196.85 inches (5 m.), can be cut per customer request.  This double rail accepts 7.5 - 8.5 mm keder. Comes in set of 2. Call (888) 727-7050 or Contact Us for a Quote on purchase and bulk options