Feature:1. STANDARD SIZE: This objective lens has universal 20.2mm standard RMS interface thread, suitable for most biological microscopes, has good compatibility.2. CLEAR IMAGING: This infinite objective lens has a clearer and sharper image, and a wider field of view than a regular achromatic objective lens.3. PARALLEL BEAM: The infinite objective lens is parallel optical beam, with no included angles, correction of spherical and sunken errors, has accurate imaging.4. COATING FILM LENS: The 4X objective lens is coated, has high transmittance and refractive index, making it less prone to scratches, fragmentation, or wear.5. METAL STRUCTURE: The microscope objective lens is made of excellent brass and stainless steel, wear and oxidation resistance, have a longer service life.Specification:Item Type: Objective LensMaterial: Brass, Stainless SteelUse: International standard RMS size thread interface, suitable for most professional biological microscopes on the marketSpecification: 4X.Package List:1 x Objective Lens1 x Storage Cylinder