These Open Circle dangle earrings hang from ball post studs. They both measure 16mm while hanging.
I have soldered a ring on the top to attach a ball post stud to dangle from. The post is a standard 20 gauge earring post size. Each earring has been formed, cut, filed then sanded, a ring soldered, with the post stud attached with earring backing and a final polished again all by me.
Due to the handmade process, each pair of earring will be slightly different from the ones pictured.