Features and Benefits: * Works with a 1/2" drive * Skin-packed * Rugged design for durability * For the use on GM 3-1/4" Removes the 3-1/4" drain plug on GM four cylinder cars where the oil filter is in the pan. Works even if the original hex on the plug has been rounded off. Simply install wrench into recess in plug and turn counter-clockwise to loosen. Reverse procedure to install.