Direct wire or interconnect fixtures with ability to snap fixtures together to create even flow of light.
High, low, on/off switch.
Steel construction.
These fixtures can be hardwired individually with no additional parts needed.
You can also hardwire one and connect the rest by simply connecting each fixture to the next. Here again, no additional parts are needed.
You can also hardwire one and the rest by using the interconnect cables. These cables are sold separately; please see Bellacor numbers 55642 and 55515.