To get the exact height of the rings go to Brownell's, find the model you want and click. Ring heights appear in the sidebar. I don't know why manufacturers rarely provide this basic information. Burris Zees tend to be a little lower than others with the same height designation (low, med, high, etc.) I use highs on my BTVS. They allow room for the scope cover and adequate clearance off the barrel. Be sure to take into account barrel taper and the angle of the scope if you use the plus/minus inserts.