Shimano Di2 Junction 'A' Clip combined with a 5 mm headset spacer. Clip has a 0° angle to place the Junction 'A' 90° to the fork steerer tube. Works with both the 3 and 5 port junction 'A' boxes. Designed for 31.7 mm ( 1 1/4") fork steerer tubes as well as some tapered steerers, such as the Giant OverDrive2 setup.