This is the remix of the allen key handles by OlleMark. His handles are very well design but for my “little” hands I've found them a bit small. And for that reason I always buy screwdrivers and other tools with thicker handles. In this case it was quite easy to add a litle more body to the otherways perfect design.  

New: skadis holder for those handles: https://makerworld.com/en/models/453997#profileId-3614