A list of exactly these parts
On this page11
The list reads, in places, like an inventory of a craft drawer
Beads, unstrung. Buttons. Nails, spikes, and staples. Bolts, nuts, and washers. Feathers. Hairnets. Flowers, artificial, except bunches.
Four of those correspond to leaves in this group
Beads unstrung covers the three bead leaves here. Buttons is a leaf. Nails, spikes and staples covers the brad leaf. And bolts, nuts and washers describes the hardware a findings drawer carries.
Unstrung is the qualifier on the bead entry and it matters
Beads, unstrung. A strung bead is part of an assembled article and falls outside the entry, so the same bead is inside or outside depending on whether it has been made into something.
Three entries on the whole list carry a dimension
Bearings, ball, 5/8-inch or less in diameter. Buckles, 1 inch or less in greatest dimension. And mica not further manufactured than cut or stamped to dimensions, shape or form.
So a buckle at an inch is exempt and the same buckle larger is not
While a button of any size at all is exempt, because the button entry carries no dimension. Two small fasteners, two different treatments, and the difference is in the drafting rather than in the article.
Greatest dimension is the phrase worth noting on the buckle entry
Not diameter, not length. The largest measurement in any direction, which settles an irregular shape in one phrase the way the small parts cylinder settles it with a gauge.
Five entries carve something back out of themselves
Artificial flowers except bunches. Furniture glides except glides with prongs. Fish hooks except snelled fish hooks. Leather except finished. Metal sheets except galvanized sheets.
The glide exception is the most specific of the five
A glide with prongs is outside the exemption and a glide without them is inside it. Which is a distinction about how an article is fixed in place rather than about what it is or how large it is.
And a snelled fish hook is a hook with a leader already attached
So again the exception turns on whether the article has been assembled into something, which is the same idea as unstrung beads expressed about a different trade.
Which gives the list a readable logic underneath the age
A bare component is exempt and an assembly is not, with three places where size decides instead. That is a coherent position about which articles can usefully carry a marking.