Most glass beads have a relatively small threading hole.  There are few beads that will not thread easily onto a 0.6mm or 0.8mm wire but sometimes you need something to go on a thicker cord, or to take multiple passes of a slimmer thread so we've brought together all of our larger hole (over 1mm diameter)  glass beads in one place.

Several of our wooden beads also have a large threading hole.