1、Contains 10mm and 16mm extension tube of different lengths, which can be used alone or in combination to obtain the required magnification. 2、With electronic contacts to support for automatic focusing and automatic exposure, etc. 3、Metal mount, fine workmanship, high precise, wear‑resistant and durable, and will not damage the lens and camera. 4、It can be matched with the body's for TTL metering and for AE mode, autofocus, adjustable aperture. 5、With the extension tube, the body and the lens are linked, fit for Sony A3000/A6500/A6300/A6400/A6000/A5100/A5000. 1 x 10mm Extension Tube1 x 16mm Extension Tube Item Type: Extension Tube SetMaterial: Plastic+AlloyColor: BlackWorking Length: Approx. 10mm+16mm/ 0.4in+ 0.6inWeight: Approx. 70.0g/ 2.5ozType: Auto FocusMount: NEX MountFit for Sony A3000/A6500/A6300/A6400/A6000/A5100/A5000 NEX Mount CameraHow to use: 1. Align the identification point of the lens mount with the identification point of the extension tube and rotate it clockwise. When you hear a "click" sound, it means the lens has been installed in place 2. Align the identification point on the lens extension tube with the extension tube to the identification point on the body, and rotate clockwise when you hear a "click" sound, it means it is installed in place 3. Press and hold the camera lens release button and rotate it counterclockwise to remove the lens together with the extension tube 4. Rotate counterclockwise, the extension tube can be removed from the lens