One of the biggest wastes of money I have ever spent on a product. It barely managed to make 4 holes with difficulty, 8mm in diameter, in a very hard granite tile that was 9mm thick, with low speeds, of course without impact and with a continuous flow of water.
Then I bought a similar diamond drill from another company with cheap drill bits (I don't want to advertise the integrity of the review) worth 2.80€. Using the exact same process, I finished the job by opening 10 more 8mm holes and it could probably open more, I haven't tested it yet.

In other words, with the money I spent on the BOSCH drill (by the way, because I was in a hurry, I bought it from a physical store for 32.60€), I could have bought 11 "drill bits from the series" and done my job.

P.S.: I'm not criticizing everything and I'm not blaming the company. I am only referring to this specific product and because I have always believed in "you get what you pay for," here it didn't work out for me and I wanted to share my disappointment - feedback.