High quality: The 20mm CO2 laser lens is made of CVD ZnSe material, featuring precision polishing and grinding processes, high temperature resistance, and a laser transmission rate up to 99.9%, reducing laser loss and delivering excellent optical performance. Double-sided coating: The 20mm laser lens is designed with dual anti-reflective coatings, providing scratch resistance and a long service life while ensuring consistent optical clarity. Wide range of application: The CVD ZnSe 20mm laser focus lens is compatible with 30W to 200W CO2 laser engraving and cutting machines, supporting precise and efficient processing for various creative and industrial applications. Product parameters: Diameter: 20mm / 0.79 inch; focal length: 50.8mm / 2 inch; thickness: 2mm / 0.07 inch; shape: meniscus. Suitable for laser wavelength of 10.6 μm. Material: Zinc selenide. Color: Gold. Package contents: 1 x Laser lens. Only the item listed is included; other accessories are not included. Note: Lighting effects and display settings may cause slight variations in color between the product image and the actual item. Measurement may vary by +/- 1-3 cm due to manual measuring.