1. SIRUI ND Square Filter - 2mm thickness can be used with SIRUI and other brands of 100mm filter holders.
2. SIRUI Filter Holder (NDH-001, Spec: 100mm) lets you attach SIRUI ND Square Filters onto full-frame camera lenses as wide as 16mm and filter diameters up to 82mm.
3. German manufactured Schott Plate Glass B270 with exclusive lens coating process, allows many ultra-thin layers of coating to be placed on each glass surface to insure perfectly linear, uniform reduction of light from edge-to edge, maximum light transmission, reduced reflections and precise color rendition.
4. Protection Coating (waterproof, oil-resistant, scratch-resistant, anti-reflective, anti-static) for easy cleaning and superior lens protection.
(Size: 100 x 100mm)