I designed this holder to keep all of my 1/4" hex bits in one place. You can mount the rack on the wall or flat in a tool box. The bits are at a handy angle to make them easy to see and select. The bits won't fall out when wall mounted or when flat on the bench. The bits can be removed individually or you can remove a whole holder (holster). Each holster holds 10 standard 6.35mm (1/4") hex bits The rack can hold up to 5 holsters. Up to 50 bits in total. Print as many sets as you need to suit your hex bit collection. I used PLA but you could use a flexible filament for the holsters (just scale the holster down to 95% to make the bits snug)