Niukou knot is a traditional hand-woven handicraft of Han nationality with a long history and belongs to a kind of Chinese knot. The scientific name is knot buckle, and the older generation is called spinning buckle. Cattle knots are shaped like diamonds, so they are also called diamond knots. Besides being used as a button, it is also a beautiful decorative knot. If matched with other decorative knots. You can also form pairs of beautiful buckles. At the same time, it usually ends with this in Chinese knot bracelets.