I can't remember, I use my Bounding Containers for version 10.2.x, it works in 10.3 but I haven't posted the NumPy-ed version on ArcScript 2.0 Beta yet...sometime soon if it gets upgraded from Beta before the UC. It does Extent rectangles (your MBR), MABR, Minimum area Circle, convex hull of course and I have code not included for MPBR (not hard to alter MABR) and W.H. and I worked on MABE (min area bounding ellipse) but not posted. Will tidy it up with variants of Concave Hulls/Alpha Shapes plus some other esoteric containers of which there are many.