High-quality Allen keys made of chrome-vanadium-steel are almost indestructible. You can buy them in different sets or as single items. You will need them e.g. when you work on your casing, bag holder, valve cover, fully suspended drive, oil filling screw and so on.
You will need a special small and long wrench socket size...
You will need a special small and long wrench socket size...
1/2" or 3/8"
with a large torque adjustment range...