Quantity: one piece Specifications: 19-22mm Chrome vanadium steel electrophoresis process, precision forging, strong toughness, durable, high strength, large torque. Two-way conversion design, the whole machine head adopts two-way conversion design, only rotates 5 degrees, the maintenance space is small and convenient, and the actual operation is more convenient and efficient. Made of high-quality chrome vanadium steel, the overall heat treatment has high hardness and large torque. The head is highly quenched to ensure safe torsion. Good quality product