If you're like me, you end up with hex bits all over one drawer of your toolbox...these won't fix it, but they help! I designed the StorageRack with the intent of printing it from TPU to keep it from rattling around in the drawer and just generally keeping things quieter and in place. To help with the TPU, the bottom surface is diamond patterned to keep from ripping your bed liner off :) The bit holders I printed in PETG, and I've been using the same set for a couple of years now without issue.