Haida HD4251-39 39mm Lens Adapter Ring for M10 Filter HolderHaida HD4251 39 39mm Lens Adapter Ring for M10 Filter Holder This Haida Lens Adapter Ring is designed to enable the use of the Haida M10 Filter Holder with a compatible lens. It is compatible with lenses that feature front filter threads and features an aluminum alloy construction for durability while remaining lightweight. Key Features Fits Lenses with Filter Threads For M10 Filter Holder Aluminum Alloy Construction