A handy dandy Y shaped allen key. Sizes are 4, 5 and 6. Enough to deal with most of the allen bolts on a bicycle. Saves the trouble of having to carry 3 pieces of allen key or the trouble of fumbling and folding the multi tool. A bit heavy though. CRV allen with steel body. Ah...a small snag. Less leverage compared to L shaped allen key. Unsuitable ergonomic for high torque wrenching.