This Vivitar Automatic Extension Tube Set includes three tubes with lengths of 12mm, 20mm, and 36mm, designed to fit lenses with a 36mm front. Made in Japan, these extension tubes are compatible with Vivitar lenses and can be used to achieve closer focusing distances and greater magnification for macro photography. The set comes with a protective case for safe storage and transport. Perfect for photographers looking to experiment with close-up shots, this extension tube set is a valuable addition to any camera kit.