TUZkozs Socket is engineered with industrial-grade Chromium Molybdenum (Cr-Mo) steel, and have a carbonized exterior brings more corrosion and wear resistance, so it can be standed greater impact force,proprietary cold forging and heat treatment process greatly improve the performance of the socket with enhanced hardness, increased wear-resistance and lifespan. We take great pride in our products, and as a valued customer, your feedback is highly appreciated. If there are any problems with our Air Ratchet Wrench or if you are not satisfied with it, please send us an email for a free replacement or full refund at the first time.