Shimano SM-JC41 Di2 Internal Frame Junction Box 4-Port CheckoutSpec= 45mm Offset spindle CrMo size 9/16" color

spindle CrMo size 9/16" color black weight 480g

From Rossi:

Reflective side logos Color Black Shoe Size Women's (US) 9

Comes with a holding function

Shimano SM-JC41 Di2 Internal Frame Junction Box 4-Port CheckoutSpec= 45mm Offset spindle CrMo size 9/16" colorShimano Di2 Frame Junction BoxFrame Junction Box connects via SD50 E tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e tubeproject. shimano. com