Buyers Products Black Steel Topsider Truck Box mounts on top of the truck bed rails to save valuable storage space inside your truck bed. Keep your equipment or tools accessible and organized with dual doors and an optional snap-in tray. Each truck box is crafted from 16 Ga steel with recessed 14 Ga drop doors with reinforced backbones. Its locking, stainless steel T-handle latches help keep your tools safe from weather and theft.