aluminum square tube 1.out dia 20- ... square ,oval, flat ect STANDARD GB/T 3880-2006APPLICATION machine,construction,decoration,furniture,industry,etc 2. About us Jinan Zhaoyang Aluminium ... Industry Co.,Ltd.,is located in the land of rose,Pingyin County in Jinan. Our ... System Certificate. Our products are widely used in construction,packaging,air conditioner,solar power,cosmetic, ...