Qingdao holy Ann metal product Limited company   

For South Korean Holy Land Security (SDA) series of spring. Door closers.
our company is a Korean owned enterprises, mainly the production of SDA spring. Door closers such gating products, have experience in production for many years in South Korea, exports around the world, stable quality, easy to install, easy to adjust, no oil leakage, wear resistance, resistance to push and pull, warranty for three years. To implement the national unified retail price, welcome you to join