About Product:This product quality assurance, price discount factory direct-use spanner is one of many kinds of spanner. One end is the same as the single-end spanner, the other end is the same as the spanner, And both ends are twisted to turn bolts or nuts of the same specification. Large industrial dual-use spanner is suitable for oil, chemical, metallurgy, power generation, oil refining, Shipbuilding and petrochemical industries. It is a necessary tool for equipment installation, equipment maintenance and repair. Duel-use spanner is divided into metric system and English system.