The Milwaukee Tool 48-22-8410 Packout Dolly is a black plastic tool storage accessory designed for use with the PACKOUT(TM) Series Modular Storage System. It features four solid casters with a diameter of 4 inches and a locking caster brake type for easy maneuverability. This durable dolly has a compact design with dimensions of 25.8 inches in length, 19 inches in depth, and 5.3 inches in height, making it suitable for transporting and storing tools and equipment in various workshops and home settings. With a 1-year manufacturer warranty, this Milwaukee Packout Dolly is a reliable and convenient addition to any tool storage system.