The Powerbuilt Master Fan Clutch AC Pulley Holding Wrench Set Kit 137 Model 647759 is a specialized automotive hand tool designed for working with auto fans and pulleys. Made by the reputable brand Powerbuilt, this set includes a holding wrench specifically designed to securely hold the fan clutch while removing and installing the AC pulley. The kit is designed to make automotive maintenance tasks easier and more efficient, making it a valuable addition to any mechanic’s toolbox.