>>11507581You can use them to test paint/primer. They're also 3mm diameter, which is perfect for fitting into most of the standard circular holes in case you need to do some emergency kitbashing.
For instance, this here is the side skirt piece on the HG M1 Astray. If you don't attach the ASS hilt to it then you're left with a huge gaping hole in the skirt that's glaringly obvious. But if you stick in a piece of circular runner and file down the top to (reasonably) match the angle of the surrounding surface, then suddenly your side skirt piece has circular panel lining instead of a huge hole that you can see through.
