Convenient Cable Retaining Post Secures and Organizes Cables on Your Ladder System This exclusive SmartRack cable retaining post kit creates a secure retaining point between sections of cable ladder to increase the cable runway system's volume. It helps you route stubborn cables, allowing for sharper turns and preventing cabling from flowing over the edge of the ladder. All mounting and installation hardware is included. The cable retaining kit fits solid and tubular steel runway measuring 1.5 x 0.375 inches (38 x 9.5 millimeters). The SRLPOST is designed for Tripp Lite’s SRCABLELADDER, SRCABLELADDER18, SRL90BEND12, SRL90BEND18 and other compatible straight and 90-degree ladder sections.