The stud holds so tightly that it cannot be opened with bare hands, there is a risk of it being pulled out. It was repeatedly necessary to use a metal tool to open it. As a pencil case, therefore, completely unusable at first. After a certain number of opening/closing of the clamp, it has straightened out and now the pencil case can finally be opened by hand.

I like
nice simple design quality material

I don't like
initially the nut cannot be opened