The StackTech™ large tool box is a large-capacity workhorse. It features an intuitive self-aligning top that allows StackTech™ boxes and totes to virtually stack themselves. An auto-locking interface ensures boxes seat securely, lock into place for transport and easily unlock with the slide of a switch. A prominent lock indicator lets you know your Stack is safe to move without second guessing. Accessing tools is simple and intuitive with a one-handed center latch, standard to every size toolbox and organizer. Inside, you'll find an internal tray along with grooves for a DIY divider (not included) to help Pros stay organized and partition their space. Full customization is at Pros fingertips with tool-free, quick-release steel accessory rails. StackTech™ Large Tool Box is built for high-impact durability with armored corners, a steel-reinforced lid and IP65 dust and water protection to ensure it can handle the toughest conditions. Dual locking points secure tools on and off the jobsite. The StackTech™ large tool box is engineered for pros to build a system unlike any other and customize it to the needs of every trade.