Features: This electronic autofocus adapter rings, automatic extension tube for Z mount lens, providing a practical solution for macro performances. This set includes 1pc 12mm and 1pc 24mm, which can be used separately or stackable together to better control the minimum focaled length of the lens. The extension tube not contain any other components, so the picture quality of the lens will not decrease. Supports electronic communication between the body and lens, thus maintaining the convenience and picture stability of autofocus and auto exposure functions. Lightweight, the metal stand provide additional durability and can bear switching between the lens and other tubes for long time use. Specifications: Material: Metal Size: approx. 55mm/2.17inch Applicable Model: for Z mount camera lens Package Includes: 1 Piece Lens Adapter note: Other accessories demoed in the pictures is not included. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.