Hollow-Stem Augering (2.25" to 12.25" ID)Rotary Wash (3" to 16")Geotechnical SamplingShelby Tube & Split-Spoon SamplingContinous SamplersAutomatic HammersMulti-Cased InstallationsMonitoring Well Installations Geotechnical Sampling Diedrich D120 Geotechnical Mud Rotary Diedrich D120 AutoHammer Diedrich D120 Shelby Tube 5-inch Diedrich D120 Hollow Stem Augering