Feature:1. 1.25inch diameter Tadapter, suitable for all standard 1.25inch telescopes and microscopes.2. For T2 TRing adapter, allows M4 or 3 mount camera to be connected to 1.25inch telescope or microscope.3. The extension tube is suitable for all standard 1.25inch telescopes and microscopes.4. Usage, first screw the extension tube into the adapter ring, then install the extension sleeve to the camera body, and finally connect it to the telescope or microscope.5. The ring adapter cannot auto focusing, the adapter ring is not electrically connected, you need to manually set the aperture and focusing.Specification:Condition: 100 percent brand newItem type: 1.25 in Extension Tube SetMaterial: AlloyColor: blackWeight: Approx. 177g Interface: 1.25 inches, for T2, M42x0.75mm, M4 or 3Applicable telescope: for T2 telescopeApplicable camera: M4 or 3 mount camera.Package List:1 xExtension Tube1 x Adapter ring