Feature 1HIGH LIGHT TRANSMITTANCE: High light transmittance, high refractive index, brighter and clearer imaging. 2ALL METAL MATERIALS: The mirror body is made of all metal materials, with fine workmanship and quality assurance. 3UNOBSCURED: The viewing is more comfortable, the lens will not be corroded or blurred, and the service life is long. 4STANDARD INTERFACE: Standard interface, interface diameter 23mm, can be used with microscopes of the same aperture. 5FEATURES AND USES: It has the characteristics of wide angle eyepiece, high eye point and large field of view, and is used for magnified observation of objects.Item Type: EyepieceMaterial: Aluminum Alloy + Optical GlassPurpose: Magnify And Observe ObjectsFeatures: Wide Angle Eyepiece, High Eye Point, Large Field Of View .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 EyepieceNotePlease allow 01mm / 00.04in error due to manual measurement. Thanks for your understanding.