Making it possible to use Korrex insulating bushes to prevent corrosion by different steel grades. These washer type plastic types need a 2 mm bigger drilled holes than normal screws, because they run into the hole to prevent contact of the screw to the drilled hole.
The lenght of the bushes rise with the thickness of the bolted parts.
For deatiling and to create screw sets with such bushes the database needs more fields to represent the bigger drill and the available lenght of the bushing.
If a lenght is to Long, because of the circumstand that it is not deliverable there should be a hint to shorten these bushes, maybe.
