VizGiz6 Pack Tightening Nut for Replacement Car Mount Screw-On 17mm Ball-Joint Fixed Adapter Head Bracket Holder Ring for Phone Air Outlet Handlebar Kit Camera DVR Camcorder Wireless Charger

It actually come with two different sizes and the smaller size fit great. I would recommend this product. Thank you!

Worked perfectly to replace a broken locking ring on an ESR phone holder.

Product information indicates it should fit a 17mm ball joint but this product does not.

I broke the piece that held my phone holder together. This was a great solution to fixing it.

Just as advertised. Not the exact same grip on the back, but exact match on the thread. I tried on different phone holders and they worked great

Bought the 6pk of 17mm screw nuts. Those 6 were actually too big for what I needed it for (a bedside tablet holder). Luckily, the pack had "4 additional nuts included for more compatible" and those fit perfectly.

I have an iOttie Easy One touch 5… None of the nuts would not go on as intended, and were all too tight. All 6 screwed on without the ball, but I was only able to get 1/6 on with the ball in the socket. This required my entire body weight to get it into the slot. It does technically work, but it definitely wasn’t perfect.

There are a lot of reviews about it being the wrong size, and I almost thought this was going to be one of those reviews.The threaded fingers on the phone holder spring out a bit, so I had to press hard to get it on initially, but then it threaded just fine. I also had to betray the included instructions. They say to put the ball in the socket before threading the nut on, but that doesn't seem to work. So, I threaded it on just a enough to stay on, and then pressed the ball into the socket and tightened the nut. It's been holding all week worth zero problems.I hope this helps.