zhiyuan valve lever thread uses the self-madeextruion . the thread intensity is high.

the thread spot and the light pole spot concentric is consistent . Overcame . the long -time puzzle domestic to roll in the silk craft to be easy to twist, valnerably to roll the silk  rold the question.
the light pole spot uses the patent technology precision to achieve the mirror surface effect opens shuts with ease. The leah proof quality is good.