Chromium vanadium steel forging, overall heat treatment. The outer layer is nickel-plated. The gear on the ratchet is yellow nickel with 12 angles. It has high hardness, long-lasting durability, is not easy to rust, is not easy to break, and is comfortable to hold. For narrow spaces or inaccessible bolts and nuts, a small angle can be solved, saving more than 30% of the force. It is widely used in various furniture, machinery and equipment, especially in the automotive repair industry.