A pair of small handles to use on M8 nuts. There are two versions:
A small one, which fits tightly over an M8 nut (exactly 13mm hole size) and a taller one, which fits more loosely (13,1mm) and which has a deeper hole and bigger inside bevel for easier fitting.
The small one should attach snugly to a nut where the big one will be a little loose.
Designed the part in FreeCAD. Have tested it on my Micro 3D printer.