Description: Lens dia. 20mm, anti-reflective coated lens for 40-100W. Meniscus type lens. Can withstand high power density, firm film, resistant to wipe. Used for processing, fits for engraving machine, marking machine, cutting machine, etc.. Material: ZnSe Specification: Coating: 10.6um?AR Both Side? Diameter tolerance: +0/-0.13mm Centre Thickness Tolerance: ±0.25mm Clear Aperture: >= 90% Diameter Package Includes: 1 Piece Reflective Len
