SINGLE 18k White Gold Screw Back, stamped 18k. thru your screwback, your screw back is likely. 041". The common sized 1" Safety Pin will fit sloppy through a. 041" back & will fit very snug. If they are able to go.

18k White Gold Screw Backs, stamped 18k. If they are able to go. thru your screwback, your screw back is likely. 041". DON'T KNOW WHAT SIZE YOURS ARE?. electrical wiring(bare Copper/Stripped) that you know the Gauge size to.