From Manufacturer
The Switch Kit with 100mm V6 Filter Holder, Switch Filter Holder, and Enhanced Landscape CPL bundles the NiSi V6 100mm Filter Holder Kit with Enhanced Circular Polarizer Filter and the NiSi Switch 100mm Filter Holder. Together, they allow for either the use of up to three separately available 100mm wide, 2mm thick filters or the use of up to two separately available 100mm wide, 2mm thick filters that each can be independently rotated 360° and independently positioned.