Southern Oilfield Services (SOS) provides innovative, American made Down Hole Drilling Tools. The company is based in Houston, Texas and has a product line which includes recognized industry tools such as the Enlarge While Drilling 5 Underreamer (EWD®5) and Expandable Stabilizer (ES®). SOS has continued to develop new tools with the diamond based Curve Reamer™ and the STealth Reamer (STR)™, a stabilizer-reamer combination tool. Current Products: Curve Reamer™ Enlarge While Drilling®5 Expandable Stabilizer® STealth Reamer™ Southern Star Underreamer Roller Reamers, Hole openers and Stabilizers.