This wrench is half the weight of the next-smallest tool, something like the Crank Brothers multi-tool. The pieces have short lengths, so you won't be able to use this as a main tool for lots of work, but works well for the quick tighten/loosening of a seatpost or stem (to make small adjustments).
Great for carrying on each ride. Compact, lots of tools, and won't corrode from sweat and water.
