3/32 x 1/4 inch eyelet/rivets. When you set them, they will leave an open hole, so you can bead or connect through it. This really provides a lovely finish to your project. We've found that most swedge holes (or, pre-drilled, stamped out holes) in American-made stampings are this size. You can always re-drill them to fit a larger eyelet or rivet...but isn't it sooo convenient to have what you need right in your workshop, at hand? And, especially, in our two most popular finishes! These are tall enough to join most typical stampings 2 or three pieces deep; the exception would be thick guiding brass. But for flower-power stampings or filigree, you can do two layers at least. Brass Plate, 48 piece packages.