Shimano bottom bracket tool TL-UN66 - for Octalink and square taperThe Shimano TL-UN66 is a tool for mounting and dismounting cartridge bottom brackets with 20-tooth gearing as seen on Octalink and square bottom brackets. It is not compatible with Hollowtech II bottom brackets. Use the TL-UN66 with a 32 mm open-ended wrench or 1/2" square ratchet.
Specifications:Function: installation & removal of bottom brackets
Drive Size: 1/2" square wrench, 32 mm open-end wrench
Compatibility: BB-UN, BB-ES, BB-6500, BB-5500, BB-7700, BB-7703, BB-7710, BB-M952