This Ernst organiser tray provides massive storage in a compact space and holds a wide range of screwdriver and socket bits. Unique design holds small bits upright on one side and holds mid to long bits sideway on the other side so everything fits in the drawer. Upright bits are secured with a taper lock fit allowing a good fit for a wide range of tools. Will hold 3 3/8" drive chucks in specially designed holes. This portable organiser is great for transportation and will securely hold tools. Conquer the cluttered mess in your toolbox with the Bit Boss. Made in USA.