It is a very cheap construction. Very thin metal that cannot withstand pressures, while that is exactly its purpose! It partially does its job, only with large nuts and only with pressure and both hands simultaneously (both on the handle and on the head). It goes without saying that I am looking for something better.

Excellent solution without the risk of getting cut by knives.
It doesn't do a good job on small chestnuts and definitely requires some strength in the hands