This unit is fitted on both sides of each compartment on a multi-compartmented vehicle to denote the U.N. designated number and the primary hazard warning diamond for the product being carried.For use with either the triplex individual digits and a 150mm x150mm x 2mm plastic panel or a single panel slid in from the side. Formed from 0.9mm 304 2B stainless steel with four fixing holes and retaining clip to hold a 550mm x 150mm panel or 4 triplex digits and panel.