The thing just works. Good solid connections and a quick twist of the knob locks it securely. Fits perfectly on my 3/8 dial gauge as well as dovetail dial gauges. It's a bit smaller than I expected, but works great as a coax arm for a tram and the like. The 8mm shank fits my 5/16" collet well.
One handle fits all. This turn signal bracket is very easy to position and locks securely into place with the twist of a single knob. I used to use a very cheap magnetic base model that was difficult to position and unstable due to the very springy fine adjustment knob. I was happy to know that this holder would fit my old magnetic base. Highly recommended.
This is the ideal holder for quickly setting up parts on a milling or drilling machine. Just slip it into a drill chuck or collet and a knob allows you to loosen and set anywhere. No more fiddling with screws and hinges to find the right angles, it's just faster. It is heavier and less stiff than other holders. I wouldn't trust him with more than a few thousand in a horizontal spindle.