an auger to assist in ground burrowing or mixing paint or concrete , is used by attaching it to an electric or cordless power source . the major advantages over previous augers are : a hex head design prevents slipping in the drill chuck , an offset boring tip provides better digging , and a removable extension allows for the digging holes from a sitting or standing position possible without straining . the cutting edge of the auger &# 39 ; s discs is sharpened and provided with a serrated edge for easier digging in hard soil . a single spring pin lock connects a first shaft to the extension shaft and multiple holes in the extension shaft allow for a multitude of auger heights .