If and Red Dot Design AwardThis filter holder kit has been awarded If and Red Dot Design AwardSquare filter holderIt Can hold 2 pcs square filters. This allows you to use multiple Nd filters simultaneously, or an Nd and a graduated Nd at the same time.Ultra-thin and large-caliberThe holder thickness is 12mm, 91mm large clear aperture, effectively avoid vignetting when used with a wide-angle lens.ND1000 FilterDouble-sided polishing process, showing high-definition picture quality. 10 gears dimming, 28-layer nano coating, dust-proof, waterproof, anti-fouling, anti-scratch, protect the lens..