The impact wrench of the power tool produces a large amount of torque, making it thicker and stronger than a manual socket. The surface is treated with phosphate coating to prevent the plating from peeling off and shattering. In addition, the pin and ring allow the tool to be secured to the anvil of the wrench (drive angle). Specifications: Material: Chrome-molybdenum steel (SCM440) Surface treatment: Manganese phosphate treatment, Country of origin: Taiwan