Tested in railway applications for resistance to shock/vibration and ability to handle extreme loads, double rail extrusions with dual mounting provide modular framework for electronics enclosures. Mounting holes for second screw promote stability and strength for modular enclosure. Offered in front and rear versions and with various interfaces, extruded aluminum rails also include sets of 1HP pitch patterns of 2.5M tapped holes for snapping in card guides and mounting backplanes.