Truck tool box mounting bracket is a device used to secure a tool box to the frame of a truck. It typically consists of two metal brackets that are fixed on the side of frame of the vehicle. Once the tool box is in position, the brackets are tightened down to hold it securely in place. There are several different types of truck tool box mounting brackets available, including universal brackets that can be used with most types of tool boxes, as well as custom brackets that are designed to fit specific truck models. Some brackets are also adjustable, allowing them to accommodate tool boxes of different sizes and shapes.