4MM hex bit organizer storage ERNST socket organizer rail

I needed a bit holder to hold just a few 4mm hex bits for my tool box. I found the perfect size was around 4.15mm for the hex holes. It is a little difficult to grab the bits from here to I may make one with more spacing however then it will compromize storage efficiency

note: due to tolerance some bits will not easily fit in a 4.15mm hole, added block with 4.2mm hole

added a 3d printable version that will click right onto an ERNST socket organizer so it can keep these little bits safe