This is a Skadis Holder for the Wera Bit-Check 30 Set. The Bit Set is clipped in from the underside and can be opened and closed while haning inside the holder.
It is mounted to the Skadis Board with the famous Skadis_Universal_Hook.stl from CSD_Salzburg. You will need to print two of those “Skadis_Universal_Hook.stl”.
Other Bit-Check Holders: