OTC's Injection Pump Wrench Set is used to loosen or tighten injection pump retaining bolts whenever pump timing adjustment or pump service is required Two specially formed wrenches are needed due to the location of the throttle, cruise control, T.V. cable bracket, cooling system crossover pipe and bracket, and the thermostat housing Both wrenches are 15 mm, 12-point, double box-end type For use on 1996-2000 GM full-size 2 and 4 wheel drive trucks, vans, and Suburbans with 6.5L diesel engines Tools similar to Kent-Moore J-41711 and J-41089