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