4m Nylon Rack (2x2m) for any type of GEMINI Sliding gate motor. The nylon rack should be screwed or bolted onto the gate with the same amount of space between the rack and the pinion. The Nylon rack is also mainly used in coastal areas. A professional installer is required for this installation to reduce any problems that can occur. If this is not done properly it could lead to the damaging of the motor or gearbox.