420x235mm Class 1 Aluminum Silk Screen Print These Panels for All Trailers, Semi-Trailers, etc. Ref. NoDimensionReflectiveSupportRemark52126A420x235Class 1Aluminum1.0mmkit 2pcs . Manufactured from aluminum and printed with red inks, these signs are designed to be highly visible thus helping to keep safe.. Extremely durable surface. Stands up waterproof, dirtproof, agniest grease, salt, weak acids ...