18 in. x 18 in. x 30 in. Diamond Plate Tread Aluminum Underbody Truck Tool BoxProtect and secure your equipment for the long haul with an underbed truck tool box that offers convenient, easy access on the job site. The Diamond Tread Aluminum Underbody Truck Tool Box from Buyers Products is built to last with durable diamond tread aluminum and, on boxes 36 in. and wider, a structural door backbone. A reinforced, recessed drop door and a locking, die cast, compression latch system helps guard your tools from weather and theft.