Beautiful washers with cogs; the bronze color is so warm and rich.
They're measured by the interior hole dimension (left to right in the larger photo):
1/2" (sold in a package of 2)
3/8" (sold in a package of 3)
1/4" (sold in a package of 5)
I would suggest using G-S Hypo Cement for gluing metal to metal permanently.
A 1/2" washer is shown in 2 photos with a 3/4" Brass Disk with 1 loop, a 1" Brass Disk with 2 holes and a small clock face button (click the thumbnails to see all the options).
A 3/8" washer is also shown with a 16mm copper bail plate.
Artwork below by Design Team Members Kristin Batsel (with brass wings) and Barbe Saint John (a 1/2" washer with a small clock face button and a chipboard gear). Click on thumbnails to see more details. More samples in the gallery.