Description: 【Material】: Tapping Expansion Screws is made of quality aluminum alloy, and the core is high strength steel, which is strong and wear resistant and has a strong bearing capacity. Whether it is windy, sunny, or rain, it can maintain a firm connection to ensure structural stability. 【Flat round head design】: Tapping Expansion Screws Fasteners adopts a flat round head design, and the surface is flat and beautiful after riveting, which is suitable for various occasions. Not only is it strong , but it also has aesthetics, which enhances the overall visual effect. 【Easy to install】: Expansion Nails Screws adopts a knock type installation method. No special tools are required. It can be easily riveted with a hammer. Whether it is a professional or an ordinary user, it can be easily started, saving time and energy. 【Firm and reliable】: Hammer Drives Rivets adopts expansion riveting. When riveting, the steel core expands and tightly grasps the riveted material to form a firm connection. The connection is firm and reliable to ensure structural stability. 【Applicable】: Head Piercing Rivets is suitable for the connection of various materials such as metal sheets, PP, and woods. It is widely used in automobile manufacturing, building decoration, electronic appliances, furniture manufacturing, and other fields. Specification: Material: Aluminum Alloy,Steel Size Chart:5mmx9mm/0.20inchx0.35inch Package Includes: 100 Tapping Expansion Screws(2 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.