Antra Auto Darkening Welding Helmet 10 Exterior Covers Lens AP5-XXX-9907 Fits AH5 Series AH5-350-001X AH6 Series 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 AH5 AH6 Series helmets like AH5-350-001X, AH6-XXX-XXXX Size 114.5X94mm / 3.70X4.51" Remove film on the surface before it is applied on the helmet