ok first of all these things rock!! they are not the big expensive name brand rod holders however they are the best rod holders you will ever find at such an awesomely low price. I personally cannot see spending hundreds of dollars on name brand rod holders when these rod holders work at a pro level quality.
-can turn and lock into place just about anywhere you need. (360 degrees)
-has a rod lock on the top so the big one doesn't take your rod
-can adjust the angle your rod sits up in the holder
-can easily take rod holder off to put boat cover on without any problems
-can install anywhere!! I put it on a thin wall on my fiberglass boat with screw anchors and it holds very well
-very durable I have had these puppies thrown around a bit as me and the boys go fishing all the time.