Having the edge on the disk offers lots of room for your knuckles to stay off the wall. There is the sweet spot location, plus we've shaped the contour to provide a harder rounded lip to grab. The disk also offers a lot more room for your hand. Lots of options on the same hold! The edge depths range from 1/2" to 3/4" deep. On vertical expect V2 and on a 45-degree wall, V6.