NiSi Adapter Ring For 100mm system V5 Holder & V3 Holder (58mm (58-82mm)) NiSi 58mm Adapter Ring For 100 system V5 holder specially for 52mm lens. Made from aviation-grade aluminum with single element processing by CNC machine. With matte black frosted finish on the surface. All of the screw accessories are made of copper and with black nickel plating. Individual package.