The holes in this rib don't really do anything but look good. Sorry, I know you wanted more meaning to it than that but sometimes all we really need is for something to look good, not to have some special function. But, I can tell you that the footing detailer does do just that. It allows you to add a little flare to the foot of a mug to give it that finished look without trimming. Now that's meaningful isn't it?
6-1/2" long by 3-3/4" wide