The LightRail? 5.0 Kit comes with a LightRail? 5.0 Drive Motor, one crossbar, instructions, mounting hardware and a 2 section 8 ft rail, so it is long enough and ready for an extra Add-A-Bar Kit (#710146) to purchase as a second crossbar. LightRail? 5.0 will move any indoor grow light, multiple sizes and weights up to 100 lbs per crossbar. The LightRail? 5.0 grow light moving system can move multiple crossbars with each crossbar allowing indoor grow lights to travel side by side. This indoor grower kit has a 0 to 60 second adjustable time delay for pausing the grow lamp at the end of each run.