This listing is for brass threaded M3 spacers. These can be threaded on to M3 rods or socket head screws (sold separately here in my shop) to provide perfect spacing for crystal chamber fins for custom chassis applications and can even be heated and press fit into a proper sized hole on a chassis for an even stronger fit. Available as one, three, or five pack units in 3mm, 4mm, 5mm, or 8mm lengths.
The knurling on these catches light extremely well and makes for a much more detailed chassis or crystal chamber.
3mm units are 1.5mm wider than the 4mm and 5mm units, as I purchased them to add a bit of variation in the chambers I am designing. Enjoy!
 Assorted Lengths){kind=link}