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.