In the Sonic Foam System, tools are stored in a well-organized, chemical resistant, CNC machined foam inlay. They are quickly accessible for fast workability, ergonomically laid out, and feature a two-tone color system for convenient survey of missing tools. Sonic socket-bit bases are made from Chrome Vanadium steel while the bits themselves are made from hardened tool steel, ensuring strength and durability. (203001, 203001-CE)