The Kent-Moore J 38817-A 4.0 & 4.6 Eng Crankshaft Rear Main Seal Installer Kit is a specialized hand tool designed for automotive use. This unit is specifically designed for installing rear main seals on 4.0 and 4.6 engines. With the manufacturer part number J 38817-A, this kit ensures high quality and precision in automotive maintenance and repair. Although it does not come with a warranty, the reputation of the Kent-Moore brand guarantees reliable and durable performance for automotive professionals and enthusiasts alike.