GJ-100 galvanized steel strand, 1x19, 100 square millimetre section, the workhorse guy strand on substation and tower projects. GJ grades exist so that a design office and a purchasing office can talk about the same thing. GJ-100 means a nominal one hundred square millimetre steel section, hot dip galvanized, in a defined construction with a defined minimum breaking load. When a specification calls for it, buying a strand that looks about the right size is not the same