This is a 3 way Spark Plug box wrench spanner. Double ended and will fit spark plugs with hex nut sizes 16mm, 18mm and 21mm. Supplied with short tommy bar. Please note that this is a short reach spanner, deep set spark plugs will need a different tool.
Overall length of this wrench is 75mm, effective length due to tommy bar hole locations is 50mm for 21mm hex size and 55mm for 16/18mm hex size.