Special designed set to repair common rail diesel injectors from brands like Bosch, Siemens, and Denso. The kit includes all necessary sockets and tools to open up defective injectors, such as injector ball valve lapping tools, hex bits (6.6mm and 7.6mm), a Denso common rail injector valve seat removal tool, an 8-sided socket for Bosch common rail injectors, and an inside fixing removal tool for Siemens common rail injectors.