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.
This tool opens and closes the oil filter on your BMW...
The small but powerful diagnostic tool Bike-Scan 100...
1/2" or 3/8"
with a large torque adjustment range...