... octopus climber, punching bag, swing set, obstacles, educational panel, lookout tower, hut, net bridge, flying fox, ... National standard galvanized steel pipe. C. Deck, stair, bridge: Wood inside with Soft Covering PVC. (Different material ... thickness with the standard of GB/T 4454-1996.4 Guardrail and handrail With Ø 60mm, thickness of 2.2mm steel, Ø 32mm, thickness of 2.2 mm pipe, Ø25 mm, thickness of ...