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These grommets are compatible with Shimano SM-GM01 E-tube Di2 and EW-SD50 cables. The overall size is 12.2x8.5x8mm, and you need to confirm that the aperture of your bicycle frame is 6mm before purchasing. Their function is to protect the cable passing through the frame hole position when wiring inside the bicycle frame, preventing cable wear, jamming, or water ingress. The material is rubber, which has good elasticity and durability. When installing, please first thread the cable through the sheath, and then insert the sheath into the frame hole to ensure stability.