If you are a professional, it is definitely not for you, but for the everyday type who occasionally needs to cut, it will do the job as long as you have a steady hand because you will need to go over the same spot more than once. After all, you are only paying 4 euros, so don't expect much.

Very good without experience it did a very good job I didn't expect it to cut so well it needs a good engraving on glass I would buy it again

I have made 8 cuts so far, and in all of them, I had to pass it over the surface twice to cut it well. One time it even left a bump, and I had to use pliers to break it. It is, of course, the first time I am cutting with a diamond, so maybe I didn't do something right.

Very good choice for glass cutting. The handle is metallic and serrated to prevent slipping of the hand. It automatically lubricates as needed. Use petroleum as a lubricant.