Professional ring / aviation spanners for commercial or occasional use 11mm and 13mm long ring spanner aviation Manufactured from C R – v steel for strength and durability 11mm and 13mm double headed spanner One spanner covering 2 different sizes (11mm and 13mm) Total length of the spanner 330mm Extra long design is perfect for when you need extra leverage is needed Suitable for access into restricted awkward areas for example on cambelt etc... Extra long slim shafts Double ended ring spanner so one spanner has 2 rings with different sizes Double-hex / 12 sided ring spanner for maximum grip