Tool for holding M8 nut

At work bit tricky trying to hold M8 nut in fencing when trying to secure bolt with it when limited space for fingers.

Pretty tight fitting and hold on nut.

Some slight defects to underside but more likely as printed it too fast and my settings.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/k5QOBZfUo3q