Designed to remove and install frost plugs used in liquid-cooled gas and diesel engines found in automobiles, trucks, SUVs, agricultural equipment and construction equipment. Simply use a hammer with the driver and appropriate disc to install frost plugs ranging from 1" to 2-3/8" in diameter Set includes: 4603-1 Installer handle (18" long); 4604-2 frost plug remover; 4604-3 frost plug disc set ( 7 each plus 1 retaining nut).