*Please note that this is a special order item and will take approximately 8-10 weeks for delivery. All special order items are non-refundable. Brass Ring for Durability Matte Black Finish Reduces Glare Precision Made Overview The Heliopan 308 Adapter 49mm Bay III Step-Up Ring offers a simple way of adapting a series of different lens mount sizes or types to one standard size. This allows using just one set of filters rather than having to duplicate filters of different sizes. Specifications Filter Size: 49mm