his product lets you easily store your Battery on the outside of your PACKOUT toolbox. Included is 1 holder set and can be mounted on the top of the box. Compatible with the following PACKOUT products: Rolling Tool Box (48-22-8426) Large Tool Box (48-22-8425) Tool Box (48-22-8424) Installation - To install, The adaptor Packout System allows the mounting of your favourite accessories to the awesome Milwaukee Packout system? Modular Storage System is the industry's most durable and versatile storage system. The tool storage box is constructed with impact resistant polymers and a metal reinforced locking point so it can withstand harsh job sites. . Modular Storage System allows users to customize and build their own storage system to easily transport and organize their tools and accessories. Modular Storage System is the industry's most durable and versatile storage system