The Screwdriver Bloks are designed to secure all tools with a shaft.  They have magnets embedded inside the Blok strategically positioned to provide grip for the blok to stay put, but also to attract the screwdriver or tool to the blok.  One Blok is sufficient to hold one driver, and each blok can be connected to each other with the included bones that can be removed for a clean finished look at the end of a run.
 
The ToolBlok system is designed around using every square inch of your drawer so this Blok takes up one square inch and fits perfectly within the system and can be incorporated with other bloks for easy planning.