Stainless Steel Chandelier Links.  Kind of a neat element that can be worked into and used in many pieces.  These come in 20 per package

9mm Tall x 18mm Wide x 0.6mm Thick.

Holes are 1.2mm.  I've tested and can fit Stainless Steel, Anodized Aluminum, BA, 18swg (1.2mm) rings through the holes.  It's snugish in that size but it will fit.  19swg or smaller is work better with more play between the hole and ring.