[Building Materials Network] Today, let's introduce a very important member of the family of hand tools - pliers. As we all know, there are many kinds of pliers, including flat nose pliers, diagonal nose pliers, wire pliers, diagonal nose pliers, needle nose pliers, wire cutters, locking pliers, pipe pliers, punching pliers, etc. But they all have a part for clamping materials, called "jaw". For jaw