The Jackson Safety NexGen Replacement Retainer is a replacement part or accessory that can help extend the life and functionality of your Jackson Safety NexGen Variable ADF Welding Helmet. The NexGen helmets feature digital controls for variable shades 9 - 13, sensitivity and delay adjustments and four independent sensors positioned to reduce the possibility of blockage during your weld. They are a popular choice for welders who are serious about their craft.