A combination chainsaw tool: a spark plug wrench and a screwdriver in one. Used for removing the spark plug and adjusting the carburetor on the saw.
Suitable for field maintenance: quickly tighten the bar, unscrew the plug and adjust the idle. Check the socket and the slot size for your model.
When replacing, clean the seat of dirt, oil and sawdust and inspect the neighboring parts: a worn unit often drags the others with it.
