Application: C/K, G/P, 6.5L DIESEL. The J-29872 Injection Pump Adjustment Wrench is required to adjust timing on the injection pump on the 6.5L diesel. Material: Made of high quality steel, our product ensures excellent mechanical and physical properties — strong, corrosion resistant and durable in use. Nice Design: The J-29872-A Wrench is a 1/2″ drive and has two locator pins that engage into the injection pump hub so it may be rotated for timing. A-Must-Have: .