Company Profile Qingdao Tenglong Aluminum Industries Co., Ltd. was established in 1998, with national first class qualification of metal door and window engineering. Our company is a specialized manufacturer of aluminum alloy doors and windows featuring high-grade, energy-saving and environmental protection. Our main products include doors and windows of German SCHUCO, and HOLZ SCHILLER, Italian RONCHETTI and TLEC60 door and window systems. In recent years, our company has developed and obtained national invention patents of aluminum alloy door and window systems of Teng Aluminum Brand. The annual production capacity reaches 300,000 square meters. Our products sell well in domestic and overseas markets. In recent years, our company has analyzed the market of container houses. Nowadays, we are committed to manufacturing and developing 20ft and 40ft container houses. Our main products