This is a pack of four Shimano Ultegra Di2 Wire Grommets. These grommets secure the internally routed wires where they enter the frame.
There are two different sizes of grommets: The SM-GM01 are for a 6mm round hole. The SM-GM02 are for a 7x8mm oval hole.
- GM-01: 6mm Circle
- GM-02: 7x8mm Oval