• EXTERNAL BOTTOM BRACKET TOOL. • FOR USE WITH OUR 32MM CNC ROD, AN ADJUSTABLE WRENCH OR 3/8 SOCKET DRIVE• EXTERNAL BB TOOL, 16 NOTCH• 39MM, SHIMANO 9000, DURA ACE BB92, XTR BB93, SHIMANO CRANK DUST CAP TOOL, 16MM HEX