This kind of gearbox is equipped with limit screws which can be adjusted within ±5° at position in Open and Closed.

The worm /gear is designed with self locking function and easy to operate.

Indicator board of open degree is directly installed on output worm gear,so indication is accurate and Audio-visual.

The are  two keyways apart with 90°degree set on the inner hole of worm gear for need.

The dedicated grease has been loade before leaving factory ,the shell is sealed up for waterfroof ClassIp65.