Key benefits Improves laser transmission and work visibility with a transmittance design up to 99.9%, enabling efficient welding and a clear working field. Doublesided coating increases lens lifespan by protecting against splashes and contaminants, reducing maintenance needs. Safe and easy to use with a 0.5 mm protective edge at a 45degree angle, designed for compatibility with handheld welding guns. Specifications Diameter: 20 mm Thickness: 3.0 mm Focal length: 180 mm Compatible with SUP laser welding equipment Coating and performance Doublesided coating provides long service life and enhanced protection from environmental hazards. transmittance design delivers light transmission and wear resistance, maintaining beam quality during operation. Safety and handling 0.5 mm protective edge with a 45degree angle design for safer handling and easier integration with handheld welding guns. Compatibility Compatible with SUP laser welding equipment and standard handheld welding configurations. Use scenarios Precision seam welding of thin metal parts in jewelry, electronics housings, or small mechanical components, where beam quality and lens protection are critical. Maintenance and replacement in SUP laser welding systems to restore focus performance and extend equipment uptime. Delicate component assembly and projects that require clean transmission and resistant optics to splashes and contaminants.