Feature:1. STANDARD THREAD: 4X achromatic objective lens, standard RMS size thread interface, suitable for most professional biological microscopes in the market.2. METAL MATERIAL: The objective lens is made of brass and stainless steel materials, chrome plating, corrosion and drop resistance, has a longer service life.3. AUTO REBOUNDING: With a spring protection device, automatic rebounding when in contact with the cover glass during observation to prevent crushing the specimen.4. COATING FILM LENS: This achromatic objective lens uses high transmittance coating film lens, which have a high refractive index to ensure brighter imaging.5. REPLACEMENT PART: The objective lens has a compact size, making it easy to install on the microscope, and can directly replace old or damaged ones.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