The Railblaza Adjustable Extender has one pivot that allows full-circle free rotation along the central axis. It also has a central knob to adjust for up to 180 degree tilt in 15 degree increments. The Railblaza Adjustable Extender gives you an additional 3 inches in height to any Railblaza accessory you choose to attach to it, making it easier to grab them when you need them.
I use this to provide an adjustable mount for my camera boom on my Yak. Works great and is quite stable.
This actually worked very well for mounting a third piece on a Railblaza deck mount. The extender enables me to swivel and angle the extra piece (a Mobi Mobile Device holder), ,which is now a perfect mount for my Garmin 78sc GPS. My only complaint is that it should have come with the Mobil Device mount in the first place as, without the extender, the Mobil device only sets at a rigid right angle and is pretty much useless.