It's stated earlier in the thread. It's a 17mm, which is the Nuvi/standard(??) size mount. Some iPhone accessories use 12.5mm balls, so it's questionable if it'll fit.
Chances are the chinese knock offs will be 17mm and "Made for iPhone" licensed things will likely be 12.5MM (so that they can't be cross used with other mounts for Nuvi, just my guess...Apple and it's sanctioned third party suppliers like their closed loop).
If you buy one and it does not work I'd be happy to take it off your hands. The easy way to test this is find someone you know with a Nuvi, or go to Best Buy and ask if you can look at the Nuvi mounts, and see if your iPhone mount attaches.
That's how I tested my Droid mount.
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Phoenix: 2003 Uni-Red New Beetle GLS TDI 140k former-automatic with a 1998 TDI Manual Transmission swap.
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