TMG Drilling manufactures a line of four-speed rotary gearbox drillheads designed for geotechnical drill rigs including wireline core drilling, auger drilling, direct push sampling, DTH drilling and other mud rotary drilling. The MS series features 1,833 rpm and 1,900 ft. lbs. of torque, while the ML series features 795 RPM and 11,004 ft. lbs. of torque. The drillheads will fit almost every make and model of drill rigs.