Feedback bottom bracket cassette wrenchfeedbacks 15mm pedal combo wrench is a two sided wrench manufactured from precision cast steel and nickel plated for extra durability it is just over 12 long to provide extra leverage one end of the tool is designed for removal of shimano htii style threaded bottom bracket cups and oversize centre lock lockrings while the other end is equipped with a shimanosram cassette lockring and standard centre lock lockring tool the cassette lockring socket is