The 852529 Pro-Builder Toolbox is a Storage set released in 2009.
This is a description taken from LEGO.com. Do not modify it.
Store your tools in a LEGO® brick!
Got a big building project lined up? Store your tools in this high-quality, stackable and portable pro-builder toolbox shaped like a big red LEGO brick! Features 2 compartmentalized levels and 6 small storage compartments hidden inside the studs on top.