Yard Butler 30" Roto Digger, with a heavy diameter shaft for digging deeper in tough soils, fits any standard 3/8" drill or larger. It digs holes with the ease of a power tool and is ideal for planting bulbs, aerating trees and shrubs, weeding, fertilizing, drilling under cement slabs, putting in fence posts, and a host of other projects. Simply hose it off for easy clean-up.