The Derex 1340-16 DR is an efficient geothermal drilling rig that will make quick work of your next project. 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-Dual rotary drilling rig will reliably get you to your next job site in style and comfort.