A 100% American-Made Option with Glue, Anodized Aluminum, and Better Thermal Conductivity The ultimate solution for increasing the quality of your work on engraving, cutting, and marketing on Co2 Laser Machines. Our complete package of lens assemblies includes all focus lengths necessary to improve your laser machine's performance. This kit includes an easy-to-clean lens assembly that lets you clean your lens without touching it. The lens is suspended in the tube by glue for stress-free optical focusing, ensuring consistent quality and reliability. You can select from four different focal lengths, including 38.1mm (1.5"), 50.8mm (2.0"), 63.5mm (2.5"), 101.6mm (4.0"), with other focal lengths available on request for the same term. We hold a +/- .15mm(.006") tolerance on the focal length of all our lenses, ensuring accuracy and precision. Our lens assembly is designed to put the focal point 10.5mm away from the front of the nozzle, which is the same distance as a AAA battery. This allows for easy and consistent spacer placement for achieving the correct focal point today and years from now. At American Photonics, we take pride in the quality of our products and services. Please allow us to mount your lens for you to the highest standards in the best possible environment, ensuring the optimal performance of your laser machine. Choose American Photonics Co2 laser Lens Tubes for unparalleled quality and reliability, and take your laser cutting and engraving to the next level.