perfect invention for getting high while working Has pros: Just forget about drilling walls and ceilings at the time of installation of profiles and fastening, it saves time just at a wild speed, plus the battery is not consumed quickly and is relatively quiet Has cons: you need to understand which nails are suitable for which concrete, even in the panels there is heavy concrete and the nails do not break through it, they bend and remain in the trunk, and are a little heavy when working with stilts on the ceiling