[Specification]: Magnification factor: 3X; Interface: approx. 1.25inch (31.7mm); Length: 65mm/2.6in [Fitment]: This 1.25 3x barlow Lens help increases the magnification, it is suitable for any 1.25 inch eyepiece [Convenient to Use]: Just simply insert the eyepiece into barlow lens, and then insert the barlow lens into the scope [Premium Material]: The 3x barlow lens is made of premium optical glass and metal; Help you observe with magnificent precision [Widely Application]: The magnification lens is a good tool to help keeping a comfortable observation with wide view; At same time a great gift for both young and old, boys and girls Specification: Color: black Material: Optical glass + Metal Magnification factor: 3X Interface: approx. 1.25inch (31.7mm) Length: 65mm/2.6in Weight: approx. 75g Package List: 1 * Barlow Lens 3X