Antra Auto Darkening Welding Helmet 10-Pack Inner Interior Cover Lens APX-350-9908 Fits 3XX Filters AH5-350-001X AH6-360-0018 AH4-330-0219G To make your helmet more comfortable for welding, the lens covers should be replaced when needed. Make sure you tear off plastic cover on surface on both sides before you install it on the helmet. FITS MODEL 360 filter Series helmets like AH5-350-001X AH6-360-0018 Size 99.7X55.8mm / 3.93X2.20" Remove film on the surface before it is applied on the helmet