Qingdao holy Ann metal products Co.   

        for the holy land, South Korea (SDA) series of spring door closer.
.         our company is a Korean owned enterprises, mainly the production of SDA spring. Closer gated products, has many years of production experience in Korea, products are exported to all over the world, stable quality, easy to install, easy to adjust, no leakage, wear resistance, resistance to push and pull, three years warranty. The implementation of the national unified retail price, welcome you to join

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