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Due to the national holidays as Golden Week, we will close 2018/4/28~2018/4/30 and 2018/5/3~2018/5/6.
This may cause delays with our responses. Thank you for your understanding.
It was a good choice to choose a round shape, 6 hex was also an option, but in a tightening about 1/4 size it is enough if you grab with pliers and it is a good product familiar to the whole view of piping without discomfort.