With riveting riveting set into the part of the component inserted into the hole, and then push the door, until the riveting set of shoulder come into contact with the surface of the door plank. Tooth grain specifications: # 4 to 1/4 and M3 to M6. Varying screw length is suitable for a variety of requirements; Stainless steel material has a good anti-embroidered performance; Tooth grain specifications: # 4 to # 1/4 & quot;; The M3 to M6.