The Lisle Corporation 10-pc Pneumatic Fan Clutch Wrench Set, No. 43350, is designed to quickly remove and install the fan clutch when repairing the water pump or fan clutch. The set includes nine driving wrenches that fit Ford, GM, VW, BMW, Chrysler, and International. Driving wrench sizes include: 7/8", 32mm, 36mm, 40mm thin, 47mm, 1-7/8", 2", 52mm for 2019 and newer Duramax, and 2-1/8" for newer International. Use with an air hammer.