Checkout the thumbgrip drivers i created for 6.4mm and 4mm bits here.

Maximize your Gridfinity workspace with this compact yet high-capacity bin, specifically designed to store 168 × 4 mm hex bits in a 2×2 footprint.

Perfect for organizing precision driver bits or small interchangeable tool heads, this bin keeps everything visible and accessible—no more digging around in cluttered drawers!

Features:

• Gridfinity 2×2 compatible footprint
• Holds exactly 168 bits (4 mm diameter)
• Tightly nested grid pattern for space efficiency
• Bits stay upright and are easy to grab