The egg-crate style Protective Foam Lid Insert fits inside all Festool Systainers, sizes 1 thru 5, to help secure and protect your most valuable items. Ideal for delicate or sensitive tools, lasers, measuring equipment, cameras or electronics. Attaches to the inside of Systainer lid. Includes 1 dimpled insert for lid. Festool Systainers make organization easy. The Systainer System offers a rugged, flexible, and convenient means of storing, carrying, and combining tools and accessories. The Systainer System makes it possible to configure highly mobile, job-specific kits, helping you to work more efficiently and stay better organized.