The Di2 junction box holder can be mounted under the stem. It's a usefull accessory for a clean cockpit. The junction holder inserted like a 6mm spacer under the stem. No rubber band disturbs the perfect cockpit unit.
The Di2 junction holder is inserted like a 6mm spacer. In this way it holds its position and rotates together with the stem.
For 1 1/8" steerer tube with 6° to 8° stems. length: 32mm (center-center)
Included in delivery: 1 Di2 Junction Kit Mount
Weight supplement: manufacturer's specs