The Shimano SIS-SP40 Outer Cap 6mm is a sealed plastic end cap designed for 4 mm shift cable housings. It features an integrated O- ing that effectively seals the cable housing, preventing the ingress of dirt and moisture, thereby enhancing shifting performance and prolonging cable life. This end cap is compatible with Shimano's SIS- P40 and SIS-SP41 systems and is suitable for various bicycle models. Key Features: Material: Durable plastic Outer Diameter: 6 mm Inner Diameter: 4 mm Compatibility: Shimano SIS-SP40 and SIS-SP41 shift cable housings Seal: Integrated O-ring for enhanced protection against contaminants Color: Black Quantity: Sold individually