TEI Rock Drills manufactures hydraulic rotary heads that are designed for smooth operation and simple maintenance in general rotary drilling applications including soil nailing and micropile operations. RDS heads go through the same testing procedure prior to delivery as patented hydraulic drifters. TEI Rock Drills has been manufacturing American-made products for almost 40 years.  Its hydraulic rotary heads, designed and produced in the TEI Colorado factory, have torques more than 10,000 pound-feet and large center bores for large air volumes. www.teirockdrills.com