Thank you for viewing. The item for sale is a Leitz Zooxy. It is a close-up ring with a helicoid that allows for significant close-up photography when used with an Elmar 5cm lens. The helicoid has some areas that are a bit stiff. Disassembly is easy, so you could replace the grease with new grease of your preference. It extends approximately 2.4cm. Mount: 39 Leica screw mount Height: Approximately 4.8cm Width: Approximately 7.5cm Weight: Approximately 334g leica Leitz Leica Helical Focusing Mount Helical Focusing Focus Slide Barnack Close-up Macro Photography ■ Understanding of Used Items The items for sale are not in perfect condition like new items. Please examine the images carefully and make a careful judgment before purchasing, and only purchase if you understand that they are used items. I try to clearly and honestly convey the condition of the items for sale, but there may be slight differences due to differences in the color of the images depending on the equipment and environment, errors in dimensions, and subjective expressions. Please understand this. ■ Requests for Bulk Purchases If items can be shipped together, we may be able to offer a discount, so please consult in the comment section first. ■ Packaging We will use recycled materials on hand, but we will pack the items so that they are safely delivered. Thank you for reading the long text. Thank you for your consideration.