<https://www.hazchemsafety.com/product/toxic-gas-folding-aluminium-diamond-250-x-250mm/#product>
<http://schema.org/description>
"An individual folding placard suitable for use on vehicles carrying hazardous substances. Cut from a durable aluminium material to the regulation 250 x 250 dimensions as required under ADR."
<https://www.hazchemsafety.com/product/toxic-gas-folding-aluminium-diamond-250-x-250mm/>