This dices are for Gaslands game (like in the title).
There are 20 and 16mm versions.
The holes are for a small piece of Ø1,75mm filament.
No support needed.
For one die you need to print 3 SHIFT faces, one SPIN, one SLIDE and one HAZARD (stress), as shown on dice label document on Gaslands site : https://gaslands.com/downloads/
The 16mm faces are updated with minor details : arrows size and point size for Hazard face.