Finish your water well, geothermal and RC exploration projects quickly and efficiently with the Derex 1340-16 DR. Derex Dual Rotary Drills have been proven repeatedly in some of the toughest unconsolidated overburden formations, including sand, gravel, glacial till, and boulders. Mounted on the Peterbilt 520, the Derex 1340-16 will reliably get you to your next job site in style and comfort.