Welcome to our store! 1, Clearer Image: This lens is coated with high light transmittance, high refractive index, and brighter image 2, Automatic Rebound: Spring protection device, automatically rebounds when it touches the cover glass during observation, protecting the lens from crushing the specimen 3, Brass Material: Uses high-quality material, fine workmanship, corrosion and fall prevention, exquisite and durable, chrome-plated for the shell 4, Application: Interface size is the international standard RMS size, can be used by most professional biological microscopes on the market 5, Basic Specifications: This objective lens has 60X magnification, common rail distance of 195mm, and parfocal distance of 45mm Item Type: Achromatic Objective Model: 60/0.85 Material: Brass Use: Microscope Accessories Interface Size: Approx. 20.2 mm / 0.80 in (International Standard RMS Size) Magnification: 60X Numerical Aperture: Approx. 0.85 mm / 0.03 in Coverslip Applicable Thickness: Approx. 0.17 mm / 0.007 in Microscope Applicable Mechanical Tube Length: Approx. 160 mm / 6.30 in Working Distance: Approx. 0.53 mm / 0.02 in Common Rail Distance: Approx. 195 mm / 7.68 in Parfocal Distance: Approx. 45 mm / 1.77 in Spring: Yes (Automatic Rebound) 1 x Achromatic Objective 1 x Storage Box Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.