Quickly removes and installs valve cotters on most overhead valve engines. Makes disassembly and reassembly of valve components quick and easy. Magnet in tool body captures valve retainers for quick valve removal and disassembly. Made of high quality metal, easy to use. Stable characteristics, high reliability. Can be used on the car or on the bench. Professional quality valve spring compressor tool kit can be used for automobiles, small marine engines and most motorcycle engines. The range of adapter sizes makes this kit one of the most versatile on the market as it can remove and compress springs from most cylinder heads. This tool kit allows you to correctly install the valve spring as it can compress the spring more easily. Instructions for Use First install the valve stem, spring and spring seat into the cylinder head, Fill the cylinder head with a hemispherical rubber gasket and place the valve lock piece into the spring seat, Then press the installer onto the spring seat, Press