Feature 1STANDARD THREAD: 4X achromatic objective lens, standard RMS size thread interface, suitable for most professional biological microscopes in the market. 2METAL MATERIAL: The objective lens is made of brass and stainless steel materials, chrome plating, corrosion and drop resistance, has a longer service life. 3AUTO REBOUNDING: With a spring protection device, automatic rebounding when in contact with the cover glass during observation to prevent crushing the specimen. 4COATING FILM LENS: This achromatic objective lens uses high transmittance coating film lens, which have a high refractive index to ensure brighter imaging. 5REPLACEMENT PART: The objective lens has a compact size, making it easy to install on the microscope, and can directly replace old or damaged ones.Item Type: Objective LensMaterial: Brass, Stainless SteelUse: International standard RMS size thread interface, suitable for most professional biological microscopes on the marketSpecification: 4X .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Objective Lens1 x Storage Cylinder