I needed to dig a few 1/2m holes for posts and was feeling too precious to use a shovel and crowbar. So I made a drill powered post hole digger
I do own a manual 200mm Cyclone Earth Auger Post Hole Digger but I only wanted a 100mm hole and was feeling lazy, so threw together a drill operated 110mm auger to put posts up for a trellis to grow dragonfruit and passion fruit on.