love unique holds like these. also, they are nice for filling in parts of my 45 deg homewall where two sheets of plywood come together. i can throw for this gap filler without worrying about splinters, etc. i'd say V3/V4 at 45, depending on how you set your problems. i'm using one as a cool ledge with thumb engagement, a feature not found the same on any of the rails currently on my sprawling home wall.