The Yakima LoadStop is an accessory for all roof racks that prevents loads shifting from side to side. The LoadStop carries ladders, lumber, canoes, and such with 4 sturdy L-shaped brackets (included). It safely holds loads by preventing lateral shifts with a grippy, ribbed surface. Great for holding thicker, taller loads with a higher vertical edge. Pair LoadStops up with Yakima HeavyDuty Straps (YAK0102) for a bomber system.