RAM® Double Socket Arm 鋼製鑰匙鎖旋鈕 - C尺寸中型

I was pleasantly surprised at how easily the double socket arm snaps onto my ball base, and the steel locking knob stays put even on rough boat rides. It's solid enough that I don't worry about my device shaking loose.

Finally, a mount that actually stays put on rough roads. The steel locking knob gives me real confidence that my device won't go flying. Fits perfectly on the standard 1.5" ball bases I already have.

The locking knob gives a reassuringly solid feel when you tighten it down, and the spring mechanism clicks into place cleanly. I just wish it came with the ball base included for the price.