1.  Carrying large, to achieve more control points and interactive interlock of the upper and lower floors;

2.  On special occasions we need not destroy the ground floor, and it can be installed in the second floor;

3.   Lifting height is high, with next to the home tank, it is durable and have long product life;

4.  Blackout coming, it is manual-down, convenient, fast and practical;

5.  It can be customized according to the site environment, the price is reasonable, economical and practical;

6.  The doors can be run through each other, and factory workshop can be opened inside and outside, convenient, saving space;

7.  It can be installed indoor and outdoor and in special circumstances it can be attached derrick.