This vintage Vivitar AT-1 automatic extension tube set comes with a 12mm, 20mm, and 36mm tube, as well as a case for storage. The extension tubes are compatible with M42/universal lenses and have a screw-in fastening. They are made in Japan and are ideal for close-up photography.

The brand is Vivitar and the type of extension tubes is specified in the aspects as well. The features include universal compatibility and the to fit lens front is 36mm. The item falls under the categories of Cameras & Photo, Lenses & Filters, and Lens Adapters, Mounts & Tubes.