The 18mm x 21mm Sealey Double End Spark Plug Box Spanner (Model MS161) is designed for larger capacity engines and commercial vehicle applications. This variant provides the two most popular sizes for bigger engines, including many trucks, vans, and larger displacement cars. The 18mm and 21mm configuration makes it indispensable for workshops servicing a diverse fleet or mechanics working on heavier vehicles. Constructed in the traditional long reach style, this spanner excels in accessing spark plugs positioned deep within engine compartments, a common challenge with modern engine designs. The included L-bar enables controlled application of force, essential when dealing with plugs that may have been in place for extended service intervals. Backed by Sealey's lifetime guarantee*, this professional-grade tool delivers consistent performance throughout years of demanding workshop use. Features and Benefits:18mm x 21mm double-ended design covers larger engine requirementsLong reach