TCT Series augers work with General Equipment’s line of Dig-R-Tach hydraulic earth auger attachments as well as competitors’ models. TCT units can drill in soft sandstone or limestone, caliche, hardpan and other tough materials. Models come in 36-, 48- and 60-inch digging depths and 6- to 36-inch diameters. They are available with 2-inch-round, 2-9/16-inch round, and 2-inch-hexagonal auger-drive connections.