I just needed the plastic part of the support for a shelf support as I had pins with the plastic bits missing.

Well I originally just holed the shelf support provided by https://www.thingiverse.com/thing:26850 at 4.9mm diameter and about 7mm deep. Pins are about 4.8~4.9mm.

I see they are not that easy to print like this, so I made the subsequent two a bit stronger a bit easier to print with 4.9mm and 5.0mm holes included as well.