This is a 2X Achromatic microscope objective lens with high quality. It is an International DIN/JIS lens. It fits common size (DIN/JIS standard) compound / biological microscopes. We also have 4X 10X 20X 40X 60X and 100X objective lenses available. Give your microscope a boost with greater power & clarity at a fraction of cost. Your satisfaction is guaranteed or your money back. Features & Specifications: 2X Magnification Power DIN Standard Achromatic Objective Lens 0.05; 160/- 20mm Mounting Thread (in diameter)