Designed to damaged, or rusted screw threads quickly and accurately in various repair scenarios. Make of 40Cr alloy steel, it has high overall hardness and good toughness. It is not easy to deform or break during long-term automotive repair operations and has a long service life. Specially designed for short shaft threads, it can quickly repair loose teeth, rust, and damaged threads on transmission shaft screws, constant velocities universals joints, half shafts, and other parts, with precisely repair effects. Hexagonal shape design, can be used with a wrench or socket, evenly distributed during the repair process, not easy to slip, stable and effortless operate. Equipped with a dedicated box, tool are organized and stored in an orderly manner, making it less likely to be lost. They are easy to carry when going out for repairs and are also convenient for organizing and storing.