Guardian II Comfort Trigger Earring Back & Post SystemThis earring backs have a double grooved post that locks into place with a push and a side trigger that releases them with a squeeze. They are hypoallergenic and come in 6. 1mm and 7. 1mm pad sizes and alloys to match your earrings. Create high quality and comfortable earrings with this Earring Backs. Earring Back Pad OD: 6. 1 mm 7. 1 mm Approx. weight: 14K 0. 23 DWT (0. 37 grams), 18K 0. 26 DWT (0. 41 grams), PT 0. 355 DWT (0. 55 grams). 14K 0. 37