Unfortunately, crimping tools made of poor quality metals. After using it several times in one of the two buyers, the handle for the damaged one has broken off. I bought two items choosing one of the most expensive offers on AliExpress believing that they will be of better quality. Unfortunately, they are very poor and it's a shame to spend money on them. It turned out that I could buy the same crimper from another seller for half the price.
The crimper for 15 mm does not work properly. It does not seal pumps tightly. Any adjustments do not help. If to unscrew it more it breaks the neck of the bottle. If to screw it does not seal and bottle leaks. Thrown money. Very disappointed.