This is a joint , which is made of chromevanadium steel material, durable for use. This makes emergency repairs a breeze. Speeds up the work with this master set which is larger and more versatile. Full ends deliver reliable torque to tighten or loosen any bolt without rounding.FeaturesMaterial: V chromevanadium steel. This makes emergency repairs a breeze. Speeds up the work with this master set which is larger and more versatile. Full ends deliver reliable torque to tighten or loosen any bolt without rounding. Springloaded detent balls securely latch onto sockets, preventing them from being dropped. Throughhole in drive ends locks onto drive . Made of premium steel with a protective oxide finish. A variety of models, specifications and styles are complete, suitable for most uses on the market, materials, and durable.Package list: 1 x Joint