Secure + Easy: Toggle Latches Securely Close And Lock Lids Of Shallow And Deep Toolboxes, And Are Easy To Operate. Quickly connect the individual storage boxes with the auto-locking latches. Removing a box from the stack is just as easy with the one touch quick release button. Stacks neatly to keep tools secure and organized. Grab the unit you need and leave the ones you don't.The stackable storage system features two 7 in. Rubber coated wheels and an ergonomic, telescoping handle for easy transport. 3 Sizes for the Perfect Fit. Extra-large rolling tote is perfect for safe and convenient storage of power tools and bulkier items. Deep toolbox with removable tote tray is ideal for storing hand tools. Shallow toolbox is a great option for small parts and accessories that can get buried in deep bins.