Commonly used hexagon socket head screws, commonly known as round head screws, have been standardized. The commonly used dimensions of fixed formwork in mold design are metric M6, M8, M 10, British BSW3/ 16, BSW 1/4 and BSW3/8. According to the size of the template, the length depends on the height between the templates, and generally the tooth depth is at least10 mm.