Rails longer than 120" must ship by freight carrier. Standard rails can be used for all SolarMount applications, but must be used for all applications where tilt legs are used. To determine row lengths required for your installation, see the sizing chart on page 4-5 of the SolarMount Sizing Charts (pdf) for arrays with top mounting clamps, or pages 6-7 for arrays employing bottom clips. Rails, L-feet, and splices are clear anodized. Hardware is all stainless steel.