I bought two for my double helix. they’re perfect! I followed the size guide and went with the 6.5mm threaded end and they fit amazing. they don’t always stay in the position I want them to like in the picture, but I don’t mind adjusting them along with the rest of my jewelry as I get ready in the morning, and they usually stay put as I go about my day. I’m transitioning from all silver to gold and I was so impressed with the quality I ordered more from Adornmonde to replace the rest of my piercings with pieces from the site! so excited for the rest to arrive :)