The Re-Flex sign is pre-drilled to fit onto the Re-Flex Frame (57471 - sold separately). This allows sign faces to be interchanged. Signs are manufactured from a 3mm thick polypropylene with an RA1 engineering grade reflective face. With all components being metal free it removes potential of theft for scrappage value whilst ensuring important safety and site messages are displayed. 4 wing nuts required to fix rectangular signs to frame. 3 wing nuts required to fix triangular signs to frame (57472 - sold separately)