Constructed from formed 0.9mm 3042B stainless steel secured together to produce a compact unit with a movable internal centre panel that allows for three different hazchem codes to be displayed. The panels have retro-reflective labels applied with the printed codings embossed. By means of a simple captive bolt with plastic head (thumb - wheel), the centre moves to one of three positions to display the correct code. All minor components are either nylon or stainless steel.