Strong antislip head: Antislip head, strong bites, stable and nonslip thread; Strong firm adsorption and more efficient operate Upgrading Phosphate high hardness steel + phosphate overall antirust Straight and concentrics: Straight and concentrics, say goodbye to slipping, say goodbye to idling, high concentricity and improve work efficiency Conquers compactly Spaces with Extended Reach After heat it is highly durability, and is not easily worn, Manufacturer: XAGMODSHN