Allstar 4.5 inch Length Black Plastic Engine Connecting Rod Guide Tool Extension for Big Block Engine - Pair features tool extensions which are 4.5 inches in length. They are designed for use with the Allstar part 96480 connecting rod guide tool. It is sold separately. when installing big block engine connecting rods. It is made from quality black plastic and sold as one pair. It is backed by a 90-day limited factory warranty.