Valve Spring Compressor & Retainer Removal Tool For removal and installation of valve springs and retainers. The tool is designed to facilitate work with valve stems of various sizes and is commonly used in engine service and repair. Contents: Remover Ø16 mm port: Used for removing valve spring retainers. Installer Ø9 mm tip: Installation tool for retainers with valve stem Ø4.57.5 mm. Remover Ø13.5 mm port: Smaller removal tool for smaller retainers. Installer Ø7 mm tip: Installation tool for retainers with valve stem Ø7.99.5 mm. Mercedes-Benz bushing: Adapter for specific Mercedes models. Features: Made of steel with anodized aluminum body for durability and corrosion resistance. Ergonomic grip with knurled surface for better control. Quick and easy to use.