
material: premium flex plus carbon steel • 1/2˝ square drive makes it easy to use with ratchets, fixed handles and torque wrenches • Compatible with: • 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