Feature: Extension tube is designed for camera to shoot at closer distance with high magnification, compatible with Nikon Z mount cameras Z6 Z7. Supports camera TTL (through the lens) metering, AE (automatic exposure) mode and AF (autofocus) mode. The mount part is made of high strength aluminum alloy, fine workmanship and long durability; built-in gold-plated electronic contact point, ensures reliable connection 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) Lightweight and simple to mount. Enables close-up shots of small subjects, insects or flowers using 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)