Halt Derailleur Outer Cable End Ferrule 4mm Plastic
Ferrules – these usually fit each end of a piece of outer and allow the cable to pass through a small hole. As standard they come in 2 sizes; 4mm for gear
This plastic cap fits the ends of gear SIS outer cable (SP40).
The external diameter measures the same as the Shimano ferrule @ 5.6mm making it a great choice