This was a great purchase. It fits perfectly in my rod holders and sits securely in place. I ordered these to put near the swim ladder so I can have a place to put my drinks as I board and unboard the boat! Works so great my buddy bought a pair for his boat as well. A must buy.
Instead of having a threaded screw adapter in the bottom, they need to have a slot cut out to allow the shaft to lock into place in the rod holder and keep it from spinning. Terrible design and I really have no use for the 3 I just bought.