• For quick removal/installation of valve collets. • Firmly push or tap tool with a hammer to remove/install, magnet in tool captures collets. • Can be used with cylinder head in situ or on workbench. • Ideal for replacing broken valve springs or valve stem oil seals without removing the head from the engine. • For in situ use, a suitable adaptor (not included) will be required to allow compressed air into the combustion chamber to hold the valve closed while compressing the valve spring.