By shortening the minimum focusing distance of Nikon Z lenses, the Viltrox Automatic Extension Tube Set also allows you to achieve greater maximum magnification for close-up shooting with any lens. This kit includes 12mm and 24mm tubes, which can be used independently or in combination for up to three different lengths to fit different types of subjects. In addition, the built-in copper contacts maintain full autofocus and auto exposure functionality, and each ring features durable Nikon Z mounts on the front and back.