... main size is1.6--2.9m,1.7--3.0m, 2.--3.6m, 2.2--4m, 3.0--5.0m ect2. tube : the thickness ... .6mm ,1.8mm ,2.0mm ,2.2mm ,2.5mm or 3.0mm Diameter for outer tube : 48mm .56mm , 60m ,76mm Diameter ... for inner tube : 40mm , 48mm , 56mm 3.surface finishing : painted ,powder coated , galvanized , HDG 4. plate size ...