17mm socket for Audi A1, A3, A4, A6, A8, for volkswagen passat, and for BMW n54, n63, and s63 engines. Also for Ford Power Stroke engines. The 17mm socket for Audi A1, A3, A4, A6, A8/ Volkswagen Passat/ BMW N54, N63, S63 engines/ Also suitable for Ford power stroke engines The 19mm for 2011 and older diesel engines/ Cummins ISB engines 21mm socket for Paccar MX 11 and MX 13 engines 22mm for the latest ISX Cummins motor 24mm for NOx and soot sensors.