LightRail 4.20 AdjustaDrive w/ Add a Lamp Kit + pre-installed Extreme Duty Trolley WheelsLightRail 4. 20 AdjustaDrive Kit comes complete with a variable speed LightRail 4. 0 AdjustaDrive Motor, a two piece 2 meter (66) 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 indoor grow Kit comes with pre installed Extreme Duty Trolley Wheels rated to 60 lbs, and these wheels have a lifetime warranty! Move two lights