Park tool advanced mechanic tool kit ak2designed specifically for the home mechanic who wants the best the ak 2 advanced mechanic tool kit is a special collection of park tools finest tools all housed in a tough toolbox the ak 2 includes over 40 tools to work on a wide variety of current model bikes a great set of carefully chosen tools a mechanic should not be without features bbt 9 bottom bracket tool for 16 notch external bearing cups bbt 32 bottom bracket tool for 20 notch shimano an