Jagwire Cable Housing End Caps If you are replacing your brake or shifter line on your bike, it is a good idea to replace your cable end caps. Ends caps can become squeezed and squished over time, so it's a good idea to replace them once in a while. These Jagwire end caps fit 4mm or 5 mm housing. Brake housing is usually 5mm and shifter housing is usually 4mm. Features Available in 4mm or 5mm sizing Available in several materials and colors | Jagwire | Cable Housing End Caps 4Mm Alloy | Black | Bottle Of 50