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

Would definitely buy again!

Very good quality. I recommend it

Identical to the name brand one for my laser, at a fraction of the cost.

Helps to focus

Very good quality. I recommend it

Yeah this is not 12mm and therefore unusable junk.

works great

Good quality but is cheaper in Walmart. Com

Good

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