A self-drilling screw is a self-drilling screw with a sharp tail that can be screwed directly into the material without pre-drilling. Common self-drilling screws include cross pan head self-drilling screws, cross countersunk head self-drilling screws, hex flange self-drilling screws, hexagonal self-drilling screws, etc. Common materials are stainless steel (SS304, SS410) and carbon steel (1022A). The performance levels are usually 4.8 and 8.8, and the surface treatments include electroplating, oxidation, and phosphating. Haina has a variety of specifications and sizes, such as M2, M2.6, M3, M3.5, M4, M4.5, M5, etc. The length is customized according to specific application requirements. Common lengths are 6mm, 8mm, 10mm, etc.