It drills in speed, like inexpensive perforators from Interskol, as compared visually right before writing this comment, with a drill of 6 in 500 concrete, this boshik was very pleasantly surprised, I took it with a blow, because the Interskol has a short wire and thought a la it would come in handy, but As a result, he gives a light to this interskol, the only thing that the gearbox is heating up, drilled 30 holes with a diameter of