1 roofing nails coil

3, reduce the bivalent iron ion in the plating aid used for hot plating wire, reduce the formation of zinc slag

The installation of guardrail should also follow certain steps, first of all, after the guardrail is transported, according to the length of the guardrail, determine the distance between the column, if the installation of the guardrail field is soft ground, then you can first dig out a 40*40*50cm embedded machine base. If it is a concrete floor, as long as the expansion bolt directly fixed.