Shandong Haiyouda Special Steel Co., Ltd. is located in Shandong Province with abundant industrial resources. It is a modern high-end special steel and precision machinery parts manufacturing enterprise integrating R&D, production, processing, sales and foreign trade export. With years of deep cultivation in the field of special alloy materials and precision processing, the company focuses on four core business segments: Special alloy steel, special steel for aerospace, high-precision die castings, and CNC precision machined parts. Relying on excellent product quality, strict production control and professional one-stop service, it has established a high-quality brand reputation in the domestic and international high-end manufacturing markets, becoming a long-term partner trusted by many industry customers.

Shandong Baiyiyuan Doors and Windows Co., Ltd originated in 2006, and its headquarter is located in Liaocheng city, Shandong Province, which is known as the "Jiangbei Water City". It covers an area of 20, 000 square meters and now has more than 200 employees. The company is an innovative enterprise integrating the production, research and development and sales of al-alloy doors and windows. Now it has more than 300 speciality stores and more than 500 dealers.

Kylssep Drainage Technology (Shanghai) Co., Ltd. is an industrial drainage environmental protection technology enterprise integrating R&D, design, consulting, production, sales and after-sales service.