Vicos decal pack

17 most commonly  bolts, maximum resolution and anti-aliasing.

Blender 2.83+/Decal Machine 2.0 / 2.1 ready

You can update them for Decal Machine 2.9

Installation: Download the provided rar file, extract, copy and paste the folder titled "Bolts" into your decal machine decals folder. Path: C:/Users/YourPC/AppData/Roaming/Blender Foundation/ Blender/(Your)Blenderversion/scripts/addons/Decal Machine/assets/Decals.

Follow the instructions to use the decals in Blender : 

https://machin3.io/DECALmachine/docs/installation/