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.

• 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