20mm CO2 Laser Mirror Si Reflective Lens - Gold-coated 3PCS for Laser Machine

I used these to replace the mirrors on my at-home 100W CNC Lasercutter. This machine sees a maybe 2 hours use a week, and I've had it a few years, and noticed that the existing mirrors needed to be replaced. The new mirrors were easy to install and instantly improved the consistency of cuts. I did a recalibration of the mirror angles prior to use, which doubtless helped, but the machine is working like new again. I can't vouch for the longevity of this product, I just don't know how well they'll stand up.

Great product delivery extremely fast

Works great. They have been holding up just fine. I use them kn my k40 and get muxh better cutting. They are thicker then the standard k40 mirrors, but they do fit just fine.

Mirrors were a perfect fit and came packaged very well...foam package, wrapped, and plastic protective cover over the mirrors. Cheap little upgrade over my OEM mirrors.

I got these to replace my cracked stock mirrors on my K40. These were drop in replacements and work great. Note: on the K40, if your mirrors keep slipping and need re-aligning, just generously dab hot glue on the screws once you have everything aligned. I used to have to re-align my mirrors very often but after I put hot glue, I haven't had to touch them at all in the past several months.