The diameter of the ball head is 16mm, which is a standard size. It may be perfectly matched if you buy a panical cup holder and a water cup holder. You only wish to tighten the nut and it’s going to not slip. The cause of the slippage is that your water cup holder does not match my ball head, and the data size of your water cup holder isn’t very accurate, because they’re all matched with the ball head sold by the cup holder merchant you bought, so there’s a difference Please preview this text before purchasing, and read this message by default after purchasing If you encounter your own water cup holder matching my ball head slipping, we refuse to go back and refund When you’ve got any questions, you’ll be able to send us a message
and comes with a 16mm bracket ball.
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