K-Edge Di2 Junction Box Stem Mount Easily Mount Your Di2 Junction Box When it comes to mounting your Di2 Junction Box, you no longer need zip ties. The K-Edge Di2 Junction Box Stem Mount secures your junction box cleanly without zip ties. It is Shimano Di2 compatible only and fits standard steerer tubes of 1-1/8". It is made from stainless steel and has a black oxide finish. Features Stainless steel construction and bendable for precise fit Secures Junction Box cleanly without zip ties Lightweight at only 6. 6 grams | K-Edge | Di2 Junction Box Stem Mount Black