Suitable for any outdoor job or project, the TRADESTACK 22 in. Rolling Tower Premium Storage Stack includes a suitcase, deep toolbox, and a rolling unit. The TRADESTACK units connect to each other, automatically stacking via a drop and lock mechanism and easily separating with a one-touch release. They are IP65 dust and water resistant, have a large storage space to fit large and heavy tools, and feature durable 7 in. wheels that enable smooth mobility for convenient transport to any destination. Compatible with VersaTrack modules, and CRAFTSMAN organizers and tool sets via an included adaptor, you will be ready to meet all your stackable storage needs.