External Bottom Bracket Tool For Bikes, Professional Shop Quality. Notch & Size: 16 Notch, 41MM. Compatible Brackets: SHIMANO 105 BBR60 ULTEGRA 6800, XT-MT800 Compatible Tools: Adjustable Wrench, 3/8 Socket Drive, LEZYNE 32mm CNC Rod. Bonus Tool: 8-Spline Shimano Crank Dust Cap Tool​​