Auto Darkening Filter, Compatible with Brand Optrel, Compatible with Manufacturer Model Number nova/ p330, Compatible with Series Nova, Features Drop in Nova/ P330 Lens, Shade 3/10, For Use With Drop in Lens for all 2 In. X 4.25 In. Welding Helmets, Lens Color Violet, Gray, Magnification No, Plate Length 4 1/4 in, Plate Thickness 0.25 in, Plate Width 2 in, Standards CE, ANSI, EAC, AS/NZS, complies withCSA Z94.3, Welding Shade Designation W3/10