* 100 Series concealed door closer, sometimes, user calls it "invisible" door closer.
* None of the cmponents in a concealed door closer are visible when the door is closed.
* 100 Series can be hidden in almost all doors thicker than 40 mm or more and offers excellent performance.
* Slide arm is standard for 100 series.
* Ideal for hotel guest rooms and executive offices.
Oubao, which was established in 1987, now is the largest manufacturer and the first corporation in domestic door closer field. It has 56 million Yuan of registered capital and 220 million Yuan of fixed assets, covering a ground area of 100000 square meters, as well as a floor space of 150000 square meters, with an annual output of 6 million door closers and 500000 panic exit device. 80% of the products were exported to overseas.
In the 1990s, Oubao took the lead in passing international quality certification such as UL\UL10. C\ETL\ITS\TUV\CE\ISO9001, was the first domestic door closer manufacturer winning both EN1154 and ANSI156.4.
Oubao also is the main drafting unit in formulating National Standard QB/T2698 and National Standard QB/T2697 . The factory's national door closer testing laboratory, approved by CNAS, can satisfy any test according to EN1154 and ANSI156.4.
After more than twenty years' development, oubao has won many honorable titles, such as "national high-tech enterprise", "provincial R&D center", "municipal major taxpayer", "municipal talent model enterprise", "harmonious enterprise in labor relation", "vice chairman unit of national security industry".
Oubao will be your best cooperator in the international door closer market.
