Park Tool 內置銅頭鋼絲扳手 - 3/16" 六角 (SW-16.3)

The hex slot fits the nipples snugly with zero rounding, and the longer shaft gives you just enough reach through the rim hole to get a proper turn on each spoke. Surprisingly light in the hand, but it doesn’t flex at all when you’re really cranking down on a stubborn truing job.

I've been struggling with internal nipples on my carbon rims, and this 3/16" hex tool engages them perfectly without slipping. The deep socket design really helps you get a good grip in tight spots.

Finally, a spoke wrench that fits those recessed nipples without stripping them. The 3/16" hex end grabs perfectly on my deep-section wheels, and the machining feels precise enough for repeated use.