Item Type: Achromatic Objective Model: 60/0.85 Material: Brass Use: Microscope Accessories Interface Size: Approx. 20.2mm / 0.80in (International Standard RMS Size) Magnification: 60X Numerical Aperture: Approx. 0.85 Cover Glass Applicable Thickness: Approx. 0.17mm Microscope Applicable Mechanical Tube Length: Approx. 160mm Working Distance: Approx. 0.53mm Common Rail Distance: Approx. 195mm Parfocal Distance: Approx. 45mm Spring: Yes (Automatic Rebound) Clearer Image: This lens features high light transmittance and high refractive index coatings for brighter and clearer imaging Automatic Rebound: Equipped with a spring protection mechanism that automatically retracts upon contact with the cover glass, helping prevent damage to the lens and specimen Brass Material: Constructed from high-quality brass with fine craftsmanship, corrosion resistance, and chrome-plated housing for durability Application: Features the international standard RMS interface size, compatible with most professional biological microscopes Basic Specifications: 60X magnification, 195mm common rail distance, and 45mm parfocal distance Package Includes: 1 x Achromatic Objective 1 x Storage Box