ZK1800 Swing gate operator Main features Worm screw driving, powerful smooth. Aluminum body quality painted. Water proof design. Simple safe release by special key. Two pieces of blocks are provided to prevent the door over travelling. Built in mechanical limit switch, easy for adjustment. Electric lock 12V DC. Available for button switch, keypad, photocells and alarm lamp. It also can be used as Linear Actuator, max. travel 330mm. Comply with industry standard of the ministry of construction of the people s republic of china Sliding Swing gate opener