It is a nut used for all anchor, but you can not understand why it is so expensive because it is a single nut. The price 1.5 times higher than the set of all anchors can not be convinced very much. One nut can be bought at another store at about 35 yen. Though it is not very naive people, no one will buy it. Such price setting with monotalou impairs trust. Of course I will not buy it.