Antra Auto Darkening Welding Helmet 10 Outside Exterior Cover Lens AP4-XXX-9907 Fits AH4 or ATH-42XX, AH7-860, AH7-X90, AH7-X30P Series Welding Helmets 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 ATH-42XX or AH4 Series helmets like ATH-4214A AH4-220-219A also AH7 Series Size 121X137.5mm / 4.76X5.41" Remove film on the surface before it is applied on the helmet