- To mount filters and other attachments with a diameter of 82 mm to lenses with a diameter of 77 mm ,- Adapter for all lenses and attachments with screw thread ,- Precision metal ring with matt black surface - Adapter Thread: 82 mm ,- Adapter Thread Type: Screwed Socket ,- Camera/Lens Thread: 77 mm ,- Camera/Lens Thread Type: Screwed Socket ,- Colour: Black 2 years legal warranty only