Klein Tools MODbox. Rolling Toolbox has 10-Inch solid rubber wheels that are larger and more durable than the leading competitor. The retractable handle is easy to remove for storage in tight spaces. Bring more tools to the jobsite with side rail attachments and back stowage compartments. Rolling Toolbox is IP65 rated, 250-Pound (113.4 kg) capacity, and made with impact resistant polymers. Easily connects with other MODbox components to make a custom mobile workstation.