PTH, headquartered in Keqiao District of Shaoxing City, has more than 200 emplyees and a long history. In 1998, PTH began to produces steel structureal parts. In those 10 years, PTH production emphasis has gone through the transformation from the production of door and window fittings to the protecting system of houses, then turns to the building structure , and finally upgraded to  expandable container houses  integrated housing production. After ten years efforts, the first container house was finished and exported to New Caledonia in 2008. Meanwhile,PTH gradually becomes a leader in the Steel Structure industry. Now, its main products can be divided into four categories, which are steel structure building, light steel villas, container house and Double-C Structure. The annual production capacity for different types of buildings can reach 500,000 square meters.