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