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-41x16-24 Pro Botttom Bracket Cup Socket installation tool is a 41mm by 16-spline cup tool with an inner bearing guide insert for cranksets with 24mm bearings (Shimano)Tool is designed for the professional removal and installation of Maxhit BSA24 & Shimano FC-25 BB cups with 24mm ID bearings for Shimano cranksets41mm x 16 tooth spline cup matches Maxhit BSA24 and all Shimano FC-25 BB cupsUnique 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: 195947061068