Focus Lens USA CVD ZnSe Dia 12 15 18 19.05 20 25 FL 38.1 50.8 63.5 76.2 101.6 127mm for CO2 Laser Engraving Cutting Machine
https://www.vogueparade.com/shopping/EN/4338/1/1005003407685142/focus-lens-usa-cvd-znse-dia-12-15-18-1905-20-25-fl-381-508-635-762-1016-127mm-for-co2-laser-engraving-cutting-machine//