Flex a rail is used as you would a standard vinyl or aluminum trailer molding. The benefit of Flex-A-Rail is that there is no flange. No flange means radical bends and compound curves can be made without notching. Flex-A-Rail can be cut with a standard hacksaw. Installation is easy by drilling holes to accommodate #6 screws every 4-12 inches through the center of the track. Screw down with #4 X 3/4" Stainless steel Flat head screws. (Double screws may be used at the ends if high load is anticipated) and your installation is complete. Flex-A-Rail is perfect for radar arches as it is standard equipment on many new boats.