One23 Allen Key Set
A 10-in-1 allen key set which folds up to fit in your pocket! Each size Allen key has a different color, so it's very quick to find the one you need after a few uses.
"Test Winner" in Jan 2014 Cycling Active's multi-tool test. " It will cover almost any mechanical situation.... Not much to go wrong, not much to break...at this price it's pretty much faultless"