Plastic mold, in the assembly, test mold, proofing process, often need to disassemble the mold, square auxiliary symmetrical edge lock, 

so the name means installed in the four sides of the mold, such as the picture.

    Its main role is that in the process of disassembly and assembly of the mold, it plays an auxiliary guiding role in the position of the mold, 

and prevents the damage of the mold in the process of the mold.

 The most simple and clear role is actually the same as the role of the guide post and guide sleeve.