Problem Solvers Under Stem Mount - Shimano Di2 17 degree Black. The Under Stem Mount allows riders to secure a Shimano Di2 Junction Box to their bike quickly and easily without the need for zip ties duct tape or other unreliable attachments.
Lightweight alloy headset spacer with nylon body (9g)
Compatible only with Shimano Di2 Junction Box
95mm length 44mm width 6mm height