These are M4 Clearance Inside Diameter spacers / stand off collars with a 6mm Outside Diameter. These are manufactured in-house from Brass using
MICROBARB® BRASS - SHORT LENGTH - M3
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Specification: thread size: M4 male female 5mm+6mm; overall size(approx): 11 x 6mm/0.43x 0.24 (L*Max.D); material: brass; color: gold tone; net
uxcell 30PCS M4 x 5mm + 6mm Male-Female Thread Brass Spacer Standoff Hexagonal Hex Standoff Spacer for DIY Computer Build, Electronic Projects, PCB Circuit Board : Industrial & Scientific
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M4 Male thread x M4 Female thread.
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ENTRETOISES EN ALUMINIUM M3 x 8 mm O/D - Standoff Stand Off Bar lève-capot tourné EUR 4,25 - PicClick FR
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M3 Male Female Brass Hex Column Standoff Support Spacer - Temu
