These are handles, that are the copy of the ones you can buy (128mm). https://owwa.com.ua/uk/ruchka-skoba-mvm-ss-1024-160-black-chorniy/?gad_source=1&gbraid=0AAAAACOtqXmGmkj0t6C21fPptM3DzPxmz&gclid=Cj0KCQjwoNzABhDbARIsALfY8VOCSqhnlyExtgAbQJgiMzn_Haj6XpHnLZr2wHuEY-phlvBoTOt6xZ4aAguyEALw_wcB
Holes are made for M4 threaded inserts for 3d prints.
Text can be added in slicer. Probably the best way.
Handles really are convenient to use and they look nice.
The author marked this model as their own original creation.