WATER RESISTANT: IP65 material designed for dust and water resistance. EASY TO CONNECT: Automatic stacking with drop-and-lock mechanism. EASY TO REMOVE: One-touch release for quick detaching of units. HIGHLY DURABLE: Structural foam design for rigid walls. STORE LARGE AND HEAVY TOOLS: Large useful volume stores big tools in one place. Suitable for any outdoor job or project that requires moving bulky tools from place to place, the TRADESTACK Rolling Unit features durable 7 in. Wheels that help enable easy transport within your workspace. Also included are a removable tray, integrated electric cable holder and tool clop holder, and a tilting footrest designed for your comfort. Plus, it is IP65 rated for dust and water resistance for lasting durability.