Holed element and locking element assembly

A holed element, comprising:

• a first curved surface;
• a second curved surface, wherein a length of the second curved surface is less than a length of the first curved surface;
• two interface surfaces, wherein one of the two interface surfaces is connected to one end of the first curved surface and one end of the second curved surface, the other one of the two interface surfaces is connected to the other end of the first curved surface and the other end of the second curved surface, and each of the two interface surfaces is concave relative to the first curved surface and the second curved surface;
• a main hole, formed and surrounded by the first curved surface, the second curved surface, and the two interface surfaces, and comprising a first hole portion and a second hole portion, wherein the first hole portion and the second hole portion respectively correspond to the first curved surface and the second curved surface;
• two slots respectively disposed at two opposite sides of the main hole;
• and
• two elastic sections, wherein each of the two elastic sections is formed between a corresponding one of the two slots and the main hole;
• wherein the holed element is plate-shaped.