[High Quality]: The 20mm CO2 laser lens is made of CVD ZnSe material, featuring precision slicing, polishing, and grinding processes. It offers high temperature resistance, a laser transmission rate up to 99.9%, reduced laser loss, and excellent optical performance. This makes it a reliable CO2 laser lens. [Durable]: Designed with double-sided solid coating, the 20mm laser lens is scratch resistant, durable, and built for long service life while maintaining 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, enabling precise processing and enhanced productivity. [Product Parameters]: Diameter: 20mm / 0.79 inch; Focal Length: 50.8mm / 2 inch; Thickness: 2mm / 0.07 inch; Shape: Meniscus. Suitable for laser wavelength = 10.6μm. Material: Zinc Selenide Color: Gold Package Contents: 1 x Laser Lens Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting effects and different display settings may cause slight variations in color between the image and the actual product. Measurement tolerance: ±1–3 cm.