We've designed this hold so that you can thumb pinch on the sloping or the slightly incut hedron side. It's extremely fun to set with on any angle. The steeper the wall gets, the harder it is to hold on to.
There is no tooled spinner screw as we just couldn't handle drilling in to the clean surface. What we tooled instead is a solid tower in the hollow back so you can drill it if you want.
The base of this hold measures 21.5 inches long, 6 inches wide; it stands 4.5 inches away from the wall and the actual place where you grab measures 4.5 inches wide.