The Inside Cover Lens for P550 is designed to protect the interior of your ADF, enhancing the longevity of your welding helmet. These grey lenses are compatible with Optrel Expert series and P550 helmets. Each package includes a set of 5 lenses, ensuring you have ample replacements. Key Features: ● Protects the interior of the ADF. ● Compatible with Optrel Expert series helmets. ● Fits P550 helmets. ● Includes 5 lenses in one pack. ● Easy to install and replace.