Enduro BBT Pro Bottom Bracket Cup Socket installation tools are designed for the professional removal and installation of bottom brackets. The updated design of the line of Enduro BBT Pro Cup Socket tools feature a unique design that allows you to switch between 24 29 and 30mm inner guide inserts or a universal insert depending on the application. The inner guide inserts simply snap-in to keep everything straight while installing and removing bottom bracket cups. Each snap-in insert features a 3/8 inch drive for use with a torque wrench or breaker bar. The entire tool is precision manufactured of the same 6061-T6 aluminum as Enduro BB cups to ensure secure no-mar cup installation and removal.