Enduro BBT-036 Flat Wrench Bottom Bracket Tool - 46mm x 12-spline 41 mm x 16-spline Interfaces For Maxhit BSA-24 FC-25 29 30The Enduro BBT 036 Flat Wrench is a splined bottom bracket tool that allows you to install and remove Maxhit bottom bracket cups for BSA24 29 and 30 as well as outboard Shimano XT Ultegra bottom bracket cups (FC 25). In addition the tool is also designed for use with standard BSA29 DUB and BSA30 cups. Allows you to install and remove Maxhit bottom bracket cups for BSA24 29 and 30 as well as outboard Shimano XT Ultegra bottom bracket cups (FC 25) The