The Park tool Bottom Bracket Tool is a tool for installing and removing Shimano and ISIS Drive splined 20-tooth bottom bracket cups. Made from investment-cast steel, the BBT-22 utilizes a flat tooth profile to ensure maximum engagement with the bottom bracket cup. Can be used with a 3/8″ drive torque wrench, 3/8″ ratchet driver, 32mm wrench, FRW-1 Freewheel Remover Wrench, or 1″ wrench.