The Special Edition Crown series and SEC Brand truck tool boxes were built for performance enthusiasts. is the first-ever truck tool box line to include industry-exclusive, premium patented features anyone can afford. SEC boxes are built with many features in addition to our standard Better Built features. The SEC Truck Chest Box is an excellent alternative to the standard crossover. It leaves the bed rails of your truck unobstructed for other uses. It can be used both in your truck and for household storage.