1. Metal tool boxes made of aluminum and stainless steel are lighter than heavy-duty metals. For outdoor use, look for a powder coat finish to resist corrosion.
2. A metal tool box's durability makes it a prime candidate for construction workers and mechanics alike, but metal is sensitive to outdoor temperatures. It can become very hot sitting in the back of a truck bed, so look for one with top or side handles with fabric or plastic coverings to prevent hand-scorching on sunny days.
3. To maintain a clean tool box, put a piece of cardboard at the bottom to soak up oil and moisture. Also, remove dirt from your tools after use before placing them in a metal tool box - clean tools mean a clean tool box.