Used for reaming, tapping, drilling and other metal cutting operations, RTD Liquid is a Viscous metal cutting fluid containing extreme pressure additives. Suitable for all metals including hardened steels, titaniums and nimonics, significantly reducing friction giving superb cutting performance. It can also be added to ordinary mineral cutting oil for the most severe cutting operations, such as broaching and gear cutting on the toughest metals. A Hand Applied Metal Cutting Lubricant.