Its merits faded against the background of a collapsed cartridge: at first it wedged in one place, but it clamped normally. For 4 months of use, I screwed in about 5 kg of self-tapping screws and drilled several holes. Yesterday, after replacing the 2 mm drill with 3, one sponge in the chuck became higher than the others, as a result, it completely fell out with 3 teeth half-broken, the 2 remaining teeth stuck in the chuck in the upper position.