M6 bolt, ~30mm long – off the shelf. Most designs with 10mm holes use a version with a countersunk head, because this will create an almost flush surface.
More info on the part soon.

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More Parts
006.1 – Wire 500 mm long, 2mm thick
058.1 – Strap 90mm, 3 holes
099.1 – wheel, M6 thread
028.1 – Doorknob node
090.1 – Headphone ear pad covers ⌀ 70mm
082.4 – M6 bolt 110mm
146.1 – Key ring ⌀ 38mm
087.1 – M6 washer 20mm
142.3 – Board 330x330mm, ⌀6mm holes
026.1 – Branch
140.2 – Board 450x330mm, ⌀6mm holes
040.1 – M4 cap nut
Pl⚲y (ノ✿◠‿◠)ノ .-‘ °
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