Bars are usually used to clamp the membrane to the board or edge of the flat roof. It is made of aluzinc, a material that is many times more resistant to corrosion than galvanized sheet metal. The degree of resistance exceeds 15 Kesternich cycles.
Three size of openings (6,8 and 15 mm) makes it usable with roofing metal screws 4,8 mm, roofing concrete screws 6,3, mm and plastic tubes.
Other applications are possible according to the need of the builder.