BRT-040 24mm Cup – 24mm ID (Shimano BBs) bearing cup for use with BRT-040 toolkit – This reciever cups is designed to mate into the BRT-040 Master Cup to receive 24mm ID BB bearings and can be flipped to be used as a guide for the same bearings during reinstallation. This cup is also compatibe with the BRT-002 cup that, when combined with BRT-040 Expander and BRT-040 24, expand the functionality of that tool to also work with 24mm Shimano BBs.