Use to hang pendants or beads with hole drilled front to back. Gently pry open, put bead on one post, and squeeze back together, lining up second post with hole.
The gap where the bead fits at it's smallest is 5.7 mm, so a pendant much thinner than this will be a bit loose, but larger will be fine (because the posts don't have to touch.) The post is 1 mm thick, so very small holes may not fit. The simplicity of the design does not fight with the pendant, so this is a good choice if you want the focus to be on the pendant.
24mm By the each.