CNCOLETECH CO2 Laser Lens Dia:15mm FL:2 or 50.8mm Laser Mirror CVD ZnSe Focus Focal Lens for CO2 Laser Engraving Cutting Engraver/Cutter 40W-200W

I had red reviews about the dimensions being off. Mine was dead on, as checked by my digital calipers.

Would definitely buy again!

Very good quality. I recommend it

k40 lasted 2 hours crap

Yeah this is not 12mm and therefore unusable junk.

Tutto OK, Amazon sempre una garanzia

This lense is so much better than the stock k40 and the difference was exceptional

Das wechseln der Linse ergibt ein weit besser Ergebnis. Die Linse muß richtig eingebaut werden und nicht mit den Fingern berühren. Beim Kauf auf den richtige Durchmesser achten.

Works great with BOSS lasers.

El producto es bueno ,pero la empresa de transporte nefasta y no es la primera vez.