Laser Lens For Laser Engraving Machine

This isGermanium(GE)  that use for laser sealsmachine. It is focus lens and the colour is black .As usual the focal length is50.8 and Diameter is 12mm. (Aim at 20W-40W laser tube) 1. Asper Chinese National Standard: GB/T 11071-2006. 2. Highpurity of 5N 6N Germanium. 3.Crystalgrowth possible at lower temperatures. 4.Multiple Choice -- Costomize to meet all your needs: germanium ingots, germanium coins,     germanium powder in different mesh, single crystal germanium, granular germanium form,     germanium wafer. 5. Abundant terminal application: human health,germanium energy watch, germaniumtitanium      sportsenergy bracelet, germanium soap, germanium mattress, optical glasses, lense, germanium lenses.   K9 mirror is reflector for laser sealsmachine.it is with gold plated and diameter is 20mm in general. (Aim at 20W-40Wlaser tube)