Shimano EW-JC304 Di2 SD300 4-Port Junction Box Synthetic The finishing touch now comes

The finishing touch now comes from Finish First: the term that covers and unites all the individual technological steps in the course of the final treatment of the base

the expected lifetime of a garment

The free-hinge plastic cuff provides increased stability

Classic crew internal neck tape for added comfort

Supports multiple hand positions for ultimate comfort

Shimano EW-JC304 Di2 SD300 4-Port Junction Box Synthetic The finishing touch now comesThe 2nd generation Di2 e Tube wiring system from Shimano has the SD300 designation. These wires and connectors are thinner than the SD50 generation. if you need to join two wires to one (3 total wires), or two pairs of SD300 wires to create a longer length for both pairs (4 total wires), you will need this EW JC304 Di2 SD300 4 Port Junction Box. This is actually a simple looking dual tube connector with internal ports on both ends of each side that