Unior 1671.1/4 Cartridge Bottom Bracket Tool Description: The 1671.1/4 Cartridge Bottom Bracket Tool is designed to install and remove internal bearing bottom brackets and lockrings. This tool is crafted from hardened tool steel that will shrug off use and abuse, and features 20 teeth with a flat profile for a tight engagement with bottom bracket cups and lockrings. The tool can either be attached to a torque wrench with a 1/2" drive for precise tightening of a part, to a 1/2" ratchet driver/breaker bar for the removal process, or by using the wrench flats on the back of the tool with an adjustable wrench. Features: Hardened tool steel construction will hold up to years of use and abuse 1/2" ratchet drive for use with torque wrenches and ratchet drivers, as well as wrench flats for adjustable wrenches Designed to remove and install internal bearing bottom brackets, including square taper, Shimano Octalink, and ISIS splined bottom brackets