Please use a handle that matches the size of the hand tap. Please use tapping oil for tapping process. If tap is tightened not sufficiently with pliers etc., nails may be damaged. Please wear gloves, safety glasses, etc. during you are using. Please tight
There is no memory that broke up with other manufacturer products, but this has broken up in half a year.
It seems that it broke from there because the thing that seemed to be an air hole was seen inside.