• 4H Series
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1. Manual operation, smooth actuation,and exact and reliable ori entation;

2.Sliding column structure has good tightness and light weight and is easy to install and dismount;

3.Internal hole adopts special processing technology which has little attrition friction, long service life;

4.No need to add oil for lubrication;

5.Panel-mounting makes it convenient to install and apply.  

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