Basically I felt that hardness was insufficient and strong. The pin part retracted and got stuck in, and the intermediate part of the threaded part was deformed and deformed. After all, both of them were damaged.
I used it incorrectly for the leaf chain of BL634 (pin diameter 8 mm), the tip broke like disposable chopsticks.
Even if you use it regularly, it may be broken depending on the state of the chain, so you had better have a spare.
It takes more time than a knockout cutter, but it can be cut while it is attached to the machine, which is convenient.