RAM® Add-A-Ball™ 配件球頭（適用於C尺寸插座臂）

Put this on my existing C-size socket arm and now I can mount my phone and GPS at the same time. The 1-inch ball clicked right into place and feels solid. Exactly the modular fix I needed for my setup.

I needed an extra mount point for my GPS and this ball screwed right into my existing setup without any wobble. The 1" ball fits perfectly with the C-size socket arms I already had.

Got my second device mounted without swapping arms. The 1" ball fits the socket snugly and the whole thing feels solid once tightened. Only wish the kit included the tightening tool, but my existing one worked fine.