This is a clasp insertion tool, also known as a "Hame-neji." It's used when inserting paper cord or fabric into the clasp. It utilizes the principle of leverage to insert the paper cord into the clasp. Please refer to the fourth photo for an example of how to use it. ・Size [Insertion part] Approximately 15mm [Total length] Approximately 185mm This item was acquired from a craftsman who retired, so there are scratches and signs of use. Please understand this before purchasing.