“A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.” - Antoine de Saint-Exupery
Although they are called "Ghostrivets" they are in fact tiny screws. The reason we have called them "Ghostrivets" is because in hoop construction, we are using them in place of the standard metal rivet (or even better - #Tinyrivets) that hold one end of the insert connection tube permanently. Once installed and 'finished' (by cutting the head off), they are almost invisible except for the outline of the screw in the hole, almost like a ghost.
The first 'version' of Ghostrivets were 4-40 3/16" slotted nylon setscrews. In order to function properly, they need to fit very tight in the hole. Using a 3/32" drill bit results in a tight hole for the ghost rivets. When installing, we found that due to the tightness (which is desired to retain the strongest fit) the amount of pressure applied by our metal slot screw driver damaged the head, sometimes to the point where complete insertion could not be assured. So to make the Ghostrivet even better (because that's what we do), we gave the Ghostrivet 2.0 a larger 'socket' head which uses an allen wrench rather than a slot screw. The socket head allows for more torque to be applied resulting in a more secure insertion. We also extended the shaft a touch as well to allow deeper insertion prior to the removal of the socket head to finish the installation.