I have been working since 2022 with these two Shuriks. week by month. There have even been several apartment renovations. Everyone is happy. The drill twists everything except concrete. On the street at -25 copes, smokes sometimes but works. By the way, it smokes at a very high load, but it works. for over 7 years now. Smoke blew into it and drill further. 30 holes in metal 2 mm thick for 1 battery with a diameter of 4-5 mm. Heard but not seen, heads break. I want to say "you first learn to work" who can break his head on this Shurik. I recommend.