Custom built interface for the K-Edge Combo mounts. Fits on the bottom of the K-Edge Garmin Mount, K-Edge Garmin XL Mount and K-Edge Wahoo ELEMNT Mount. Shimano Junction 'A' interface works with both Shimano SM-EW90-A and SM-EW90-B. Dual GoPro mounts for headlights or action cameras. GoPro mounts are 78 mm center-to-center. Requires two M3 x 6 mm flat-head socket cap screws. Use of thread locking compound recommended.