AUTO-LOCKING DRAWER - Front-loading drawer allows easy tool access with auto-locking mechanisms that prevent drawer from opening during transport DURABLE STEEL RAILS - Enable smooth drawer opening, closing, and long life 9” RUGGED RUBBER WHEELS - Conquer any terrain with oversized rubber wheels QUICK-CONNECT LATCHES - Fast and effortless interlocking connectivity allows you to quickly stack and unstack toolboxes ATTACHMENT-READY - Aluminum-reinforced corners with attachment interface compatible with STACK PACK attachments 70 LB. DRAWER CAPACITY; 250 LB. LOAD-BEARING CAPACITY - Heavy load capacity for tools, materials, and accessories REMOVABLE REAR HANDLE - Extends for easy jobsite navigation and removes fully for storage in a covered truck bed when your work is done IMPACT PROTECTION - Built with an impact-resistant polypropylene body and aluminum-reinforced corners to withstand the toughest jobsite conditions FULL RANGE COMPATIBILITY - STACK PACK toolboxes, organizers, accessory cases, and toolbox attachments are endlessly configurable across the full STACK PACK system ONE-YEAR WARRANTY - Register your new products and get a one-year limited warranty on your FLEX STACK PACK toolboxes and organizers