Hole diameter is the number that matters
A bead fails on its bore, never on its outside diameter. Makers work to a simple rule: the hole should run at least 1 mm wider than the cord, and wider still where the cord doubles back through, which it does in almost any square-knot sequence. That is the whole reason the large-hole wooden beads are listed on their own, and why a bead sized for 3 mm cord will fight you on 5 mm. Cord stays in mm here, the convention every macramé pattern uses; bead measurements appear in inches on the page.
Threading without shredding the cord end
Bind the cord end with a scrap of tape or a dab of glue and it feeds through without blooming into fluff. A large-eye needle or a folded loop of wire does the same job for soft single-twist cotton. Count generously while you are at it. One plant hanger might swallow three beads, a beaded feather garland a dozen, and running short mid-piece means hunting for a wood tone you no longer have. That is the case for the bulk wooden bead pack over a small handful.
Finished beaded pieces, not just parts
Some of this group skips the knotting entirely. Beaded feathers, a small knotted Christmas tree and a bead-trimmed plant hanger arrive ready to hang, so the same wood tone can run through a shelf without anyone tying a knot. If cord thickness is the thing you came to solve rather than trim, the spools sorted by gauge are a faster way in.