Thank you for viewing. This item for sale is a Leitz Zooxy. It's a close-up focusing ring with a helicoid, designed to be used with an Elmar 5cm lens, allowing for significant close-up photography. The helicoid has some stiffness. Disassembly is easy, so you could replace the grease with new grease of your preference. It extends approximately 2.4cm. It's designed for a focus slide, but the mount is 39 Leica screw, so you can enjoy it in various applications. Height: Approximately 4.8cm Width: Approximately 7.5cm Weight: Approximately 334g leica Leitz Leica Helical Focusing Mount Helical Focusing Barnack Close-up Macro Photography ■ Understanding of Used Items The items for sale are not in perfect condition like new ones. Please examine the images carefully and make a careful judgment before purchasing, and only purchase if you understand that they are used items. I strive 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, dimensional errors, 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 description. Thank you for your consideration.