Yantai Tri-Circle Lock Industry Group Co., Ltd. Established in 1930 is the oldest lock manufacturer in China. Yantai Tri-Circle International Trade Co., Ltd. Is one of subsidiaries of Yantai Tri-Circle Lock Industry Group Co., Ltd., which was established in April 2004, registered capital RMB33 million., and has exclusive rights for the sale of Tri-circle brand iron & brass padlocks. The main products are more than 100 specifications of over 10 types, including Tri-Circle brand padlocks, bicycle locks, chain locks, wire locks, combination locks, all kinds of door locks, automotive locks, safes, magnetic card locks, smart card locks, anti-theft system for apartment, anti-theft doors, biological indentification syestem, etc.

Tri-Circle brand locks have won the only highest quality award - Gold Award in the national lock manufacturing line, and taken the lead to pass ISO9000, enjoyed high prestige at home and abroad and honored as "King of Lock" by customers for superior quality and credit.

"Tri-Circle" trade mark was registered in 1952, and approved by Trademark Office of China State Administration for Industry & Commerce as "China Renowned Trademark" in January, 1999, which is the only one in lock manufacturing line so far. On Jan. 28, 2002, it was ranked among "China Ten Kings of Locks" by China National Hardware Association. In 2009, Tri-Circle technical center was approved as National Level R&D Center.