Spark plug Bosch WSR6F fits Stihl 070 090 AV Contra 070AV new version
AF19 mm width across flats
Suitable only if the installed spark plug has a 19 mm WAF.
If the installed spark plug has a 21 mm WAF, then you need the item n° 56401AR2319.
The central electrode of the Bosch spark plugs is made of nickel alloy with a copper core, which allows a better resistance to wear. The copper core has a very good thermal conductivity which protects against any overload.
This spark plug is recommended by the manufacturer.