LightRail? 4.20 AdjustaDrive Kit comes complete with a variable speed LightRail? 4.0 AdjustaDrive Motor, a two-piece 2 meter (6 ft 6 in) Rail, an Add A Lamp Kit with another 2-meter Rail, Push/Pull Rod, Auxiliary Trolley, instructions and hardware for moving two lights with the enclosed motor. In addition, this kit comes with pre-installed extreme duty trolley wheels rated to 60 lbs and these wheels have a lifetime warranty! Move two lights along 4 meters (12 ft) of rail and all from one kit box ? the LightRail? 4.20. With a 0 to 60 second adjustable time delay for promoting even growth from end to end plus the added feature of 2 to 4 ft per minute adjustable speed control that covers a wide range of lamp intensities and travel distances. It will move any lights and hoods, multiple sizes and weights and is a scalable system.