Feature: extension tube is designed for camera to shoot at closer distace with high magnification, compatible with Nikon Z mount cameras Z6 Z7. Support camera TTL (through the lens) metering, AE (automatic exposure) mode and AF (automatic focus) mode. The mount part is made of high strength aluminum alloy, fine workmanship and long durability; built-in gold-plated electronic touch point, perfect with the lens. Three different groups of magnification, can be used alone (12mm or 24mm) or in combination (12mm+24mm=36mm). (the focal length of lens should be greater than the length of extension tube used) Light weight and simple mount. You can easily make close-up shots of tiny subjects, insects or flowers taking advantage of the extension tube. Specification: Model: DG-Z Color: Black Material: Gold-Plated Electronic Contact + Aluminum Alloy Mount Extension Tube Length: 12mm, 24mm Focus Mode: Auto Focus Extension Tube Size (12mm): 67.5 * 12mm / 2.66 * 0.47in Extension Tube Size (24mm): 67.5 * 24mm / 2.66 * 0.94in Extension Tube Weight (12mm): 37g / 1.3oz Extension Tube Weight (24mm): 45g / 1.6oz Package Size: 9.5 * 9.5 * 7.7cm / 3.7 * 3.7 * 3in Package Weight: 150g / 5.3oz Packing List: 2 * Macro Extension Tube (with front and rear covers)