3M Auto Darkening Filter, 2.8" x 4.2", Shades 5, 8-13, For Use With 4EFL4, 4EFL5, or 4EFL6

3M PAPR (powered air-purifying respirator) darkening light filters install on welding PAPR (powered air-purifying respirator) helmets to reduce eye strain and allow workers to see welds more clearly. Magnifying plates install inside the headgear so workers can see welds and their working area more clearly. Filters and plates are used with helmets of the same brand and series.