EWK Auto Car Overhead Valve Keeper Remover Installer Engine Tool Kit Set 5/16''-3/8'' and 4.5mm-7.5mm Fits most overhead valve applications. Smaller size fits new chrysler new world engine and some toyota four cylinders. Magnet in tool body captures keepers for quick removal and valve disassembly. Quickly removes and installs valve keepers on most overhead valve engines.