Hello,Firepei.Sorry for the inconvenience caused by my negligence, I will try my best to elaborate below.
These two models have the same function and are suitable for metal and non-metal CO2 cutting. The laser tube power is above 150W.
Reflective lens: H-Series H2G and H-Series CO2-Laser Heas use D30MM reflective lens.
Focusing lens: H-Series H2G and H-Series CO2-Laser Heas use a diameter of 25mm and a focal length of 63.5 (usually used for metal cutting, follow-up, oxygen catalysis) or 101.6mm (non-metal).
Conventional D28H15 diameter 1.5mm-metal cutting
Raised D28 H15 caliber 3.0mm-non-metallic cutting