four items : (first / second / third / forth)
Tube size (317.5mm/197mm/317.5mm/197mm) material : steel(galvanized or else)
thickness : 0.6mm above
width : out diameter : (49/49/50/50)
l : steel(galvanized or else)
thickness : 0.6mm above
width : out diameter : (49/49/50/50)
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