This 2-piece set removes and installs fan clutches. The set includes a universal holding wrench and a universal turning wrench. The holding wrench is adjustable to fit the bolts that attach the pulley to the water pump. The turning wrench has the 5 common fan clutch nut sizes built into one tool: 7/8 inches (22 mm), 1-7/16 inches (36 mm), 1-9/16 inches (39 mm), 1-7/8 inches (47 mm) and 2 inches (50 mm). Both wrenches are long to provide extra leverage for stubborn fan clutch nuts. Made of heat treated alloy steel to provide strength.