I created this model for one-of-a-time usage. I highly suggest buying metal version, as plastic will not hold up to time & day to day use.
I uploaded small testing piece, so that you don't need to waste a lot of filament due to scaling issues.
Diameter of the “hole” is 10mm / 1cm.
Original creator is FACOM.
Photo preview is form https://toolguyd.com/facom-40r-fast-action-combination-wrenches/
The author marked this model as their own original creation.