Inivizilite track extrusion with chase wireway. 4 Standard track with additional wire way along sides for longer runs without going back to the transformer. Clear high grade polycarbonate extrusion allows two 10-gauge wires, one per side, to chase along the run for an additional power feed. Sockets snap easily into track after sockets have been installed onto cable--no tools required. Easy installation: 3 pre-drilled holes per 4 extrusion, field cuttable and drillable. Track is flexible to a 4 radius. Sold as a pack of 4.