1Different Length Extension Tube Ring: The extension tube ring set consists of 10mm / 0.4in and 16mm / 0.6in lengths of extension tube ring and can be used alone or in combination to obtain the desired magnification. 2Equipped with Electronic Contact: Equipped with electronic contact to support auto focusing, auto exposure, etc. After extension tube ring set is connected, the camera body and lens can be linked. 3Diverse Features: Fine workman, high accuracy, wear resistant, durable and will not damage the lens and camera. 4Multiple Matching Methods: It can be used with TTL metering and AE mode of the camera body. 5Manufacturing Material: Made of high quality plastic and alloy materials, it is strong and durable, which undoubtedly extends its service life. 6Applicable Camera: Suitable For EOS M, M2, M3, M5, M6, M6 II, M10, M100, M200, M50 and for EOS M mount Camera. Item Type:AutoFocusExtensionTubeRing Weight: Approx.65g / 2.3oz Color: Black Material: Plastic + Alloy Type: Auto Focusing Working Length: Approx.10mm / 0.4in And Approx.16mm / 0.6in Mount: For EOS M Mount Applicable Camera: Suitable For EOS M, M2, M3, M5, M6, M6 II, M10, M100, M200, M50 Camera 1 x 16mmExtensionTubeRing 1 x 10mm ExtensionTubeRing