NiSi 100mm System V5 Filter Holder Kit- 67mm 72mm 77mm Adaptor Ring+82mm Holder Ring+cpl(86mm) for 52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm Lens Compatible with Lee Cokin Hitech Singh-ray The base of the NiSi Filter System. Compatible with all 2mm thick 100mm filters Machined aluminum construction. Includes a removable 86mm glass circular polarizing filter. Can hold 1 round filter and 3 100mm filters.