These are the Guardian II Positive locking 6.1mm outside diameter earring backs with Comfort triggers that fit a 0.89mm diameter post. They are also called Guardian II Ear Nuts and Guardian II Safety Earring Backs. Positive locking earring backs have been on the market since the French first produced the ZOP system in
Earrings — Otto Frei
These are the Guardian II Positive locking 6.1mm outside diameter earring backs with Comfort triggers that fit a 0.89mm diameter post. They are also
14KY,14KW,18KY & 18KW Guardian II Positive Locking 6.1mm Earring Backs
These are the Original Guardians 6.1mm outside diameter Positive locking earring backs with straight triggers that fit 0.89mm diameter posts (also
14KY,14KW,18KY,18KW & Platinum 6.1mm Guardian Positive Locking Earring Backs
Ear Post & Backs — Otto Frei
These are genuine Guardian .035 (0.89mm) diameter positive locking earring posts for the 21-GPL Guardian II 6.1mm earring backs with Comfort Triggers
14KY,14KW,18KY,18KW & Platinum .035 x .395 Guardian Positive Locking Posts Only
Poste de oreja y respaldos — Otto Frei
Ear Post & Backs — Otto Frei
Ear Post & Backs — Otto Frei
Earrings — Otto Frei
Ear Post & Backs — Otto Frei
Ear Post & Backs — Otto Frei
Earrings — Otto Frei
Earrings — Otto Frei