DoorKing’s Maximum Security operators are designed to operate vehicular slide gates in limited Class lll& restricted Class VI applications only. These operators should not be used in serving the general public. Designed to mount in front, center or rear of the gate without any costly or time consuming field modifications. To center mount the operator, the operator requires the pedestal mounting base (optional on 9210, 9220). The speed control on the operators (except 9210) allows the user to set the speed of the gate from 1/2 to 2 feet per second & provides slow-start and slow stop functions as well.