General description UNIOR Cartridge Bottom Bracket Tool is designed for easy and efficient use with various bottom bracket systems. Its premium flex plus carbon steel construction ensures durability and reliability during maintenance tasks. Technical specifications Material: Premium flex plus carbon steel Drive: 1/2" square drive Compatibility: Shimano Octalink® bottom brackets with outside notches, Bontrager® and Truvativ® ISIS Drive® type bottom brackets, Bosch® Generation 3 and Generation 4 E-bike system front chainring lockring