... electric power plant, chemical plant,petrifaction enterprise. 2.Specification: NO. Post dia ball dia handrail dia rai dia tread plate HL1 ... ball middle),used in middle and high contruction platform fence post (3)three H=1200(ball middle),used in higher ... Component column--handrail-rail--bend--capped end--pipe base--tread stair plate5.Advantage: this ball fence post is hot dipped galvanized,anti ...