High Quality: --- The professionally treated carbon steel of the universal flexible spark plug wrench is more wear-resistant than conventional rubber and has a longer service life, making it more convenient to use. One 14mm spark plug wrench + one 16mm spark plug wrench. . Design: --- The universal flexible spark plug wrench is very flexible, can be rotated 360 degrees, and is magnetic, so you don't have to worry about it flying off during disassembly. . Wide application: --- Universal flexible spark plug wrench is very compatible and can be used with various vehicles such as for BMW N54, N55, N63, for Benz E90 etc. . Material: --- Universal flexible spark plug wrench uses high-quality carbon steel materials, which makes the spark plugs more flexible, wear-resistant and longer lasting than conventional spark plugs.: - Spark plug socket uses high-quality carbon steel materials, which makes the spark plugs more flexible, wear-resistant and longer lasting than conventional spark plugs.