This is a brand new 4X Achromatic microscope objective lens with high quality. It is a standard (International DIN/JIS) lens. It fits common size (DIN/JIS standard) compound / biological microscopes. We also have 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: 4X Magnification Power Achromatic Objective Lens DIN Standard 20mm Mounting Thread (in diameter)