Shimano peg spanner tlfc21designed for the removal and installation of shimano chainrings and self extracting crank caps features one end has pegs to hold the back of chainring bolts and the other has pegs that locate into the self extracting boltsa 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shimano toolsfrom chain reaction cycles the worlds largest online bike store