Finally I got multi tool, Leatherman skeletool CX!
It is very simple multi tool, not has so many kinds of tool.
But seems easy to use, and it was useful for me.
I bring it in my work everyday.
I need pliers sometime, but it was bother me to keep real one anytime.
That product has 25 years warranty, it seems too much long, but they have confidence for their quality.
I need to learn their attitude as an engineer.