Special designed for using on all engines with overhead valves. 
Valve springs will not be bended or loosen. Works on gas or diesel engines.
Fits most overhead valve applications.
Magnet in tool body captures keepers for quick removal and valve disassembly
Quickly removes and installs valve keepers on most overhead valve engines. 
Works on valve stems from 4.5 to 7.5mm and 5/16" to 3/8".