Park Tool BBT-10 Adjusting Cap Tool
Designed to remove and install the adjusting caps on Shimano Hollowtech II crank/bottom bracket systems
Made from investment cast steel, the BBT-10 provides the strength and leverage needed to remove seized caps
works great to remove and put on my shimano crank arms. A must have if you to several installs a year. Park tools are the best. It is the only brand I use on my bikes.