Shimano E-Tube Di2 External Junction B Box Color:Black Rubberized folding t-handle

Rubberized folding t-handle

Made from high-torque industrial steel and through-hardened for long life

Simply insert the specially sized jaws into the masterlink

Equal to the sizing of the Mavic® 108 471 01 wrench

the Park Tool P-Handled Hex Wrench delivers precision

Shimano E-Tube Di2 External Junction B Box Color:Black Rubberized folding t-handleShimano E Tube Di2 External Junction B Box The Shimano Di2 SM JC40 is designed to connect SD50 E tube wires along four points; front derailleur, rear derailleur, cockpit junction and battery mount. The B Box is used to split the main wire from Junction A to the front and rear derailleurs. It can also be used to connect a seatpost mounted battery to the system. Specifically designed for externally mounted systems and mounts underneath bottom bracket