This Adapter Ring for 105mm Polarizer Filter with 1mm Thread Pitch from Formatt Hitech is made of nylon and is compatible with the Formatt Hitech 100mm Lucroit Filter Holder system, the Formatt Hitech 100mm Aluminum Modular Filter Holder, the Cokin Z-PRO Filter Holder, and the LEE Filters Foundation Kit.
When this adapter ring is used with the Formatt Hitech 100mm Lucroit Filter Holder, that holder must be first fitted with a set of the Formatt Hitech 2 x 2mm, 2 x 4mm, or 3 x 2mm slot adapters for the 100mm Lucroit Filter Holder. The adapter ring can then snap onto one of those slot adapter sets.
For use with the Formatt Hitech 100mm Aluminum Modular Filter Holder, the Cokin Z-PRO Filter Holder, or the LEE Filters Foundation Kit, this adapter ring features holes that allow one to use the screws included with those holders to attach this adapter ring.