VEVOR Axle Spindle Thread Chaser Set: Your Reliable Repair Assistant. This thread chaser set is made from 40CR steel with a plated and blackened finish, featuring a hardness of HRC45-55 for durability and strong corrosion resistance, specifically designed for harsh environments. The set includes 10 tools with comprehensive metric and imperial sizes to meet all shaft thread repair needs. The unique internal groove design facilitates debris removal, streamlining the repair process. It comes with a storage case for easy transport and organization, enhancing work efficiency.