Though you may not always need both at the same time, we always think it's helpful to have two tools in one place. The Feedback Sports Bottom Bracket/Cassette Wrench comes with a durable cast steel construction and is eager to remove Shimano/SRAM lockrings and external bottom brackets all in the same day, if needed. As if that weren't enough, it also works as a Centerlock brake wrench, saving you valuable space in your toolbox and eliminating the need to have separate tools for each piece of your drivetrain.