Product Feature: 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 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 .