These quartz cleaning lenses are an essential accessory for handheld fibre laser welding machines. Measuring 20mm in diameter and 4.5mm thick, with a focal length of 800mm, these lenses are designed to protect the laser optics and ensure optimal performance. Made from high-quality quartz material, they are durable and long-lasting. The set includes two lenses, allowing you to have a spare on hand. Proper maintenance and cleaning of these lenses are crucial for maintaining the accuracy and efficiency of your laser welding machine. With their precise specifications, these lenses offer a reliable solution for your industrial laser welding needs.