... 2000,CE,ISO40010,OHS Outdoor playground equipment1. Post :With diameter 114mm column with thickness of 2.2mm goldplated tubes or steel tubes ... 1985,technology standard :BS 1387-1985) 2. Guardrial and handrail with diameter 60mm ,thickness of 2.2 mm steel , diameter32mm , ... Metal :National standard steel pipe ,welded by the Japanese OTC robot welding system ,strong and smooth ,no rag ,no welding SCAR ...