All sharpening sets whose part number ends in "C" have a spark plug wrench that has a socket length of 25mm, specifically for Husqvarna, Dolmar, Jonsered, Komastu and Zenoah.
All sharpening sets whose part number ends in "L" have a spark plug wrench that has a socket length of 50mm, specifically for Stihl, Echo, Oleo Mac, Partner, Pioneer and Solo