Item name:worm gearbox with lock(exporting gearbox, gearbox)No.: QDX3 This gearbox is 90degree revolving driver s Item name:worm gearbox with lock(exporting gearbox, gearbox)No.: QDX3This gearbox is 90degree revolving driver setting, it is suitable for ball valve , butterfly valve, plug valve and other valves, and this gearbox is with lock , it can prevent somebody open and transfering ....and ...