1. For 1.25 inch T mount telescope, for M42 mount camera. 2. Interface size: 1.25 /1.25. 3. Can be used with T2 full model adapter ring, suitable for all brands of cameras. 4. Advanced hard plating technology, the whole is smooth and good hand feeling. 5. Easy to install, directly mount. Spec: Condition: Brand New Item Type: Telescope Lens Adapter Material: Telescope Lens Adapter Interface size: 1.25inch /1.25inch External thread: M42*0.75mm Internal thread: M28*0.6mm Compatible camera: for various brands of cameras packing list: 1 x Telescope Lens Adapter