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.BBT-46x12-STD Pro Bottom Bracket Cup Socket installation tool is a 46mm by 12-spline cup tool with a universal insert that works with all bearing sizesUnique updated design allows you to switch between 24, 29 and 30mm inner guide inserts or a universal insert, depending on the applicationInner guide inserts simply snap-in to keep everything straight while installing and removing BB cupsEach snap-in insert features a 3/8 inch drive for use with a torque wrench or breaker barEntire tool is precision manufactured of the same 6061-T6 aluminum as Enduro's BB cups to ensure secure, no-mar cup installation and removal Enduro BBT Pro Bottom Bracket Cup Socket Tools Bottom Bracket Tools UPC: 195947060252