A “combination fastener” is a special type of fastener that combines different kinds of fastening elements, such as screws, nuts, washers, etc., to achieve specific fastening needs. Multiple components can be included, each with a specific function and role. By combining these parts together, more complex fastening functions can be achieved, such as connection, fixing, sealing, etc. For example, a common combination fastener can consist of screws, nuts, and washers. Screws are used to pass through the workpiece and fit with the nut to tighten by rotating the nut. Washers are used to provide support, cushioning or sealing. The advantage is that it can be customized and adjusted according to the specific application requirements. By selecting appropriate fastening elements and combinations, you can meet different fastening requirements and improve the reliability and security of the connection. It should be noted that the selection and use of combination fasteners should be determined according to the specific application scenarios and requirements, including the type, size, material and so on. The correct selection and use of combination fasteners can ensure the fastness and reliability of the fastening, thereby improving the quality and safety of the product.