I assume that the on-board tool of the motorcycle is not for emergency use, but for everyday maintenance. The reason is that it is unlikely that we can utilize the tool in emergency unless we are accustomed to the tool from now on and it is better to be able to maintain it when it is noticed. So we chose Ko-ken, a socket tool specialist, not cheap. Even at 12 corners, it is gentle to bolts as it is in face contact, making it suitable for regular maintenance. I also liked Ko - ken 's T - shaped slide handle and doing the kurukuru is convenient, I like it rather than taking up the place.