Back when I did commercial work I did every size you could think of. Had teeth with one and two inch sides welded on them so I could go in one inch increments from 12 to 28 inches. The exc. I have now has a 1, 2, and 3 foot bucket along with a 5 foot smooth edge. I use the 5 foot a lot cleaning lagoons and cutting down building pads when I load direct on the truck. 3 foot is my favorite for digging and I whine like a baby when someone wants a 1 foot footing.