- Function: Lightweight bicycle lock ring tool designed to remove and mount a bicycle centre cap that uses an 8-slot, toothed disc locking ring. Portable and easy to use for on-the-spot adjustments and repairs. - Precise fit and protection: The locking ring tool is engineered to match the bottom bracket housing precisely, enabling efficient removal of the holder while reducing the risk of damage to your bicycle parts. - Size and specifications: Package includes the bicycle bottom bracket tool and an inner bearing tool. Outer diameter 43.5 mm, inner diameter bore 23.8 mm, with 8 teeth. Please check the size before purchasing. - Compatibility: Suitable for all eight-notch bottom bracket shells from Shimano and ISIS SRAM Truvativ Drive. - Performance and reliability: Designed for accurate engagement and smooth operation, supporting quick maintenance without unnecessary wear or harm to components. - Use scenarios: - Routine maintenance at home to replace or service centre caps on bikes with eight-slot locking rings. - On-the-road or shop repairs when a quick cap removal or installation is required. - Upgrading or inspecting bottom brackets that use eight-notch shells to ensure proper fit and function. - Notes: Confirm the size and compatibility with your bottom bracket model before purchase to ensure proper fit.