三腳旋鈕組（3顆），用於GM-8或G-11經緯儀三腳架

The aluminum feels solid in the hand, and swapping the mount head on my G-11 is now a quick, tool-free job. These knobs are a simple upgrade that makes a real difference.

The threads on these knobs are cut cleanly and engage the mount perfectly, making setup noticeably quicker. No more fumbling with a wrench to attach the head.

Finally, a knob set that actually stays tight—the stainless steel threads bite perfectly into the tripod without stripping. I swapped these in and mounted my head in under a minute, no tools needed.