This tool is specifically designed for preventing the rear oil seal from damage when it is installed. It is easy to use. Installs the rear oil seal accurately saving down time and extra expense. Applicable: Isuzu 3.5 Ton, Models: 4JB1, 4JG1, 4JG2,4HJ1, 4JJ1, NKR, NKR77,  130HP / 150 HP. Oil Seal Genuine Number: BZ4962-E, 3-9707-1561