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 contains: Installer Handle (18″ long.); Frost Plug Remover; Frost Plug Disc Set (7 ea., plus 1 retaining nut).