The larger UniStar Deluxe incorporates a moving jaw on one side that clamps the saddle plate with a single handknob. This is available with a choice of either our 2" or 3" Jaw. Which one to choose can typically depend on the equatorial mount that the UniStar may share duty with or if the scope has a particular dovetail plate of its own. If neither of these factors pertain, then the customer can choose the saddle/plate based on the size of the scope.  Best recommendation is that for over 15 lbs, the 3" jaw will carry the load better. The 2" jaw will carry all the rails listed above, the 3" jaw will carry Losmandy, Astro-Physics and Celestron's wider plate, etc, and our own 3" plate. Even if only one jaw size is required, purchasing both jaws ($25 additional) allows many benefits in that it will allow the UniStar mount to accept any dovetail rail between 1.5-3.25" which means no future problems with EQ mount compatability. And it will also ensure easy resale in the future as the mount will not be restricted to compatibility with only certain EQ mounts. UniStar Light and MicroStar can be upgraded to this head, its actually a necessity if you are trying to use a 3" mounting plate, or if you prefer the non-marring design of the clamping jaw rather than the clamping screw.  

The Super 8 Deluxe is the same design as the larger UniStar Deluxe but with a longer saddle with 2 clamping jaws.  This is recommended for loads over 25 lbs or for longer refractors.  Its a $50 upgrade from the standard Deluxe UniStar.